RHS Exam Study Guide
(508).jpg "RHS Exam Study Guide - Quiz")
Are you preparing for the Radiation Health and Safety (RHS) exam? Want to revise your concepts with this RHS Practice Test that is given here for free? Give it a try, and we assure you that you'll find this test very useful. The RHS exam is conducted by the Dental Assisting National Board (DANB) as a way for candidates to demonstrate their expertise in the proper safety procedures for taking x-rays. If you think you know everything about this topic, then try the quiz given here.
- 1.
The film emulsion is hardened during ______.
- A.
Development
- B.
Rinsing
- C.
Fixation
- D.
Washing
- E.
Drying
Correct Answer
C. FixationExplanation
During the process of fixation in film development, the film emulsion is hardened. Fixation involves removing the unexposed silver halide crystals from the film and making the image permanent. This is done by using a fixing solution that dissolves the undeveloped silver halide crystals while leaving the developed silver image intact. The hardening of the film emulsion during fixation helps to prevent any further chemical reactions and ensures that the image remains stable and durable.Rate this question:
-
- 2.
A higher kilovoltage produces x-rays with:
- A.
Greater energy levels
- B.
Shorter wavelengths
- C.
More penetrating ability
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
A higher kilovoltage produces x-rays with greater energy levels, shorter wavelengths, and more penetrating ability. When the kilovoltage is increased, the electrons in the X-ray tube are accelerated with more energy, resulting in X-rays with higher energy levels. This increase in energy also leads to shorter wavelengths, as wavelength and energy are inversely proportional. Additionally, higher kilovoltage X-rays have more penetrating ability, meaning they can pass through denser materials more easily. Therefore, all of the given options are correct.Rate this question:
-
- 3.
Which of the following is not found on the label of the side of the film packet?
- A.
Film speed
- B.
Expiration date
- C.
The phrase "opposite side toward tube"
- D.
Number of films enclosed
Correct Answer
B. Expiration dateExplanation
The expiration date is not found on the label of the side of the film packet. The label typically contains information such as the film speed, the phrase "opposite side toward tube," and the number of films enclosed. However, the expiration date is usually printed on the packaging or the box in which the film packet is contained, rather than on the label of the side of the packet itself.Rate this question:
-
- 4.
Which of the following describes scatter radiation?
- A.
Radiation that exits the tubehead
- B.
Radiation that is more penetrating than primary radiation
- C.
Radiation that has been deflected from its path by interaction with matter
- D.
None of the above
Correct Answer
C. Radiation that has been deflected from its path by interaction with matterExplanation
Scatter radiation refers to the radiation that has been deflected from its original path by interacting with matter. When X-rays pass through the patient's body, they can be scattered in different directions due to interactions with tissues and other objects. This scatter radiation can be harmful and can contribute to radiation exposure for both the patient and the healthcare provider. Therefore, it is important to take precautions to minimize scatter radiation during X-ray procedures.Rate this question:
-
- 5.
Identify the unit of measurement that is used to describe the amount of electric current flowing through the x-ray tube.
- A.
Volt
- B.
Ampere
- C.
Kilovoltage peak
- D.
Force
Correct Answer
B. AmpereExplanation
The unit of measurement used to describe the amount of electric current flowing through the x-ray tube is ampere. Ampere is the SI unit for electric current and is defined as the flow of one coulomb of charge per second. It is commonly used to measure the strength of electric currents in various electrical devices, including x-ray tubes.Rate this question:
-
- 6.
The total energy contained in the x-ray beam in a specific area at a given time is termed:
- A.
Kilovoltage peak
- B.
Beam quality
- C.
Intensity
- D.
Millamperage-second
Correct Answer
C. IntensityExplanation
Intensity refers to the total energy contained in the x-ray beam in a specific area at a given time. It is a measure of the power or strength of the beam and is determined by factors such as the number of x-ray photons and their energy. Kilovoltage peak refers to the maximum voltage applied across the x-ray tube, beam quality refers to the penetrating ability of the x-ray beam, and millamperage-second refers to the product of milliamperage and exposure time.Rate this question:
-
- 7.
The thermometer for manual processing should be placed in the _______.
- A.
Developer solution
- B.
Water bath
- C.
Fixer solution
- D.
Either a or c
- E.
All of the above
Correct Answer
E. All of the aboveExplanation
The correct answer is "all of the above" because the thermometer for manual processing can be placed in either the developer solution, water bath, or fixer solution. This means that it can be used to measure the temperature in any of these solutions during the manual processing of whatever is being processed.Rate this question:
-
- 8.
At 68º F, what is the optimal development time for manual film processing?
- A.
2 minutes
- B.
3 minutes
- C.
4 minutes
- D.
5 minutes
- E.
6 minutes
Correct Answer
D. 5 minutesExplanation
The optimal development time for manual film processing at 68°F is 5 minutes. This is because the temperature affects the chemical reactions involved in developing the film. At a higher temperature, the development time may need to be shorter to prevent overdevelopment, while at a lower temperature, the development time may need to be longer to ensure proper development. Therefore, at 68°F, 5 minutes is the recommended time for optimal results.Rate this question:
-
- 9.
If kilovoltage is decreased with no other variations in exposure factors, the resultant image will:
- A.
Appear lighter
- B.
Appear darker
- C.
Remain the same
- D.
Either a or b
Correct Answer
A. Appear lighterExplanation
When the kilovoltage is decreased with no other changes in exposure factors, the resultant image will appear lighter. Kilovoltage (kV) is responsible for controlling the contrast and penetration of the X-ray beam. Decreasing the kV reduces the overall energy of the X-rays, resulting in less penetration through the patient's body. As a result, the X-rays are more absorbed by the patient's tissues, leading to a lighter image with less contrast.Rate this question:
-
- 10.
What is the greatest contributor to artificial radiation exposure?
- A.
Radioactive materials
- B.
Medical radiation
- C.
Consumer products
- D.
Weapons production
- E.
Nuclear fuel cycle
Correct Answer
B. Medical radiationExplanation
Medical radiation is the greatest contributor to artificial radiation exposure. This is because medical procedures such as X-rays, CT scans, and radiation therapy use ionizing radiation, which can increase a person's exposure to radiation. These procedures are commonly performed and are essential for diagnosing and treating various medical conditions. While radioactive materials, consumer products, weapons production, and the nuclear fuel cycle also contribute to artificial radiation exposure, medical radiation is the largest contributor due to its widespread use in healthcare settings.Rate this question:
-
- 11.
In manual film processing the optimal temperature for the developer solution is:
- A.
55º F
- B.
68º F
- C.
78º F
- D.
80º F
- E.
90º F
Correct Answer
B. 68º FExplanation
In manual film processing, the optimal temperature for the developer solution is 68º F. This temperature is considered ideal because it allows for proper chemical reactions to occur, resulting in accurate and high-quality film development. Higher temperatures can cause the developer solution to work too quickly, leading to overdevelopment and loss of detail. On the other hand, lower temperatures can slow down the development process, resulting in underdevelopment and poor image quality. Therefore, maintaining the developer solution at 68º F ensures optimal results in manual film processing.Rate this question:
-
- 12.
Which of the following statements is incorrect?
- A.
Velocity is the speed of a wave
- B.
Wavelength is the distance between waves
- C.
Frequency is the number of wavelengths that pass a given point in a certain amount of time
- D.
Frequency and wavelength are inversely related
Correct Answer
B. Wavelength is the distance between wavesExplanation
The statement "Wavelength is the distance between waves" is incorrect. Wavelength is not the distance between individual waves but rather the distance between two consecutive points (such as crests or troughs) on a wave that are in phase with each other. In other words, it is the distance over which the wave's shape repeats itself. It is commonly measured from one crest to the next crest or from one trough to the next trough.Rate this question:
-
- 13.
Portion of a processed radiograph that appears light or white is termed as _____.
- A.
Radiolucent
- B.
Radiopaque
- C.
Dense
- D.
High density
Correct Answer
B. RadiopaqueExplanation
A portion of a processed radiograph that appears light or white is termed as radiopaque. Radiopaque refers to an area on the radiograph that is dense and does not allow the passage of X-rays, resulting in a white appearance. This can be caused by materials such as metal or bone, which absorb X-rays and prevent them from reaching the film or detector.Rate this question:
-
- 14.
Wavelength is used to determine __________.
- A.
The temperature of the cathode filament
- B.
Energy and penetrating power of radiation
- C.
The speed of a wave
- D.
None of the above
Correct Answer
B. Energy and penetrating power of radiationExplanation
Wavelength is used to determine the energy and penetrating power of radiation. This is because the wavelength of a wave is inversely proportional to its energy. Shorter wavelengths have higher energy and greater penetrating power, while longer wavelengths have lower energy and less penetrating power. Therefore, by measuring the wavelength of radiation, we can determine its energy and how deeply it can penetrate different materials.Rate this question:
-
- 15.
Dental patient has thick soft tissues and dense bones. to compensate for this increase in subject thickness and to provide an image of diagnostic density the dental radiographer may:
- A.
Increase the exposure time
- B.
Increase the milliamperage
- C.
Increase the operating kilovoltage peak
- D.
Any of the above
Correct Answer
D. Any of the aboveExplanation
The correct answer is "any of the above" because all three options mentioned (increasing the exposure time, increasing the milliamperage, and increasing the operating kilovoltage peak) can help compensate for the thick soft tissues and dense bones of a dental patient. By increasing these factors, the dental radiographer can ensure that the resulting image has sufficient diagnostic density to accurately assess the patient's dental condition.Rate this question:
-
- 16.
When viewed on a light source, a dental radiograph that demonstrates very dark areas and very light areas is said to have
- A.
High contrast
- B.
Low contrast
- C.
High density
- D.
Low density
Correct Answer
A. High contrastExplanation
A dental radiograph that demonstrates very dark areas and very light areas when viewed on a light source is said to have high contrast. This means that there is a significant difference in brightness between the dark and light areas on the radiograph. High contrast can be beneficial in dental radiography as it allows for better visualization of the different structures and details within the image.Rate this question:
-
- 17.
The device used to hold the extraoral film and intensifying screens is termed as _____.
- A.
Screen holder
- B.
Film holder
- C.
Cassette
- D.
Any of the above
Correct Answer
C. CassetteExplanation
A cassette is the device used to hold the extraoral film and intensifying screens. It is a light-tight container that protects the film and screens from exposure to light and allows for easy handling and positioning during dental imaging procedures. The cassette ensures that the film and screens are held securely in place and properly aligned with the X-ray beam, resulting in accurate and high-quality radiographic images.Rate this question:
-
- 18.
Which of the following film sizes is known as the standard film?
- A.
Size 0
- B.
Size 1
- C.
Size 2
- D.
Size 3
Correct Answer
C. Size 2Explanation
Size 2 is known as the standard film size because it is the most commonly used film size in the industry. It is widely available and compatible with most cameras and projectors. Size 0 and size 1 are smaller film sizes typically used for specialized purposes, while size 3 is a larger format used for panoramic or wide-angle shots. Therefore, size 2 is considered the standard film size due to its widespread use and compatibility.Rate this question:
-
- 19.
Which beam alignment devices are recommended for use with the paralleling technique to reduce radiation exposure to to the patient?
Correct Answer
snap on ring collimatorExplanation
A snap-on ring collimator is recommended for use with the paralleling technique to reduce radiation exposure to the patient. This device helps to limit the size and shape of the x-ray beam, ensuring that only the necessary area is exposed to radiation. By reducing the scatter radiation, the patient's overall radiation exposure is minimized.Rate this question:
- 20.
The size of the darkroom is determined by all the following factors except:
- A.
Volume of radiographs processed
- B.
Type of processing equipment used
- C.
Humidity level of the room
- D.
Space required for duplication of films
- E.
Number of persons using the room
Correct Answer
C. Humidity level of the roomExplanation
The size of the darkroom is determined by factors such as the volume of radiographs processed, the type of processing equipment used, the space required for duplication of films, and the number of persons using the room. However, the humidity level of the room does not affect the size of the darkroom.Rate this question:
-
- 21.
Difference in the degrees of blackness between adjacent areas on a dental radiograph is termed :
- A.
Density
- B.
Contrast
- C.
Subject thickness
- D.
Diagnostic quality
Correct Answer
B. ContrastExplanation
The correct answer is contrast. Contrast refers to the difference in the degrees of blackness between adjacent areas on a dental radiograph. It is an important factor in dental radiography as it helps in distinguishing between different structures and identifying any abnormalities or pathologies present. By analyzing the contrast, dental professionals can make accurate diagnoses and treatment plans.Rate this question:
-
- 22.
Identify the term that describes how dark and light areas are differentiated on an image:
- A.
Contrast
- B.
Density
- C.
Intensity
- D.
Polychromatic
Correct Answer
A. ContrastExplanation
Contrast refers to the difference in brightness between the light and dark areas of an image. It is the term used to describe how well the different elements in an image stand out from each other. By adjusting the contrast, the visual impact and clarity of an image can be enhanced, making it easier to distinguish between different objects and details.Rate this question:
-
- 23.
All the following factors affect the life of the processing solutions except
- A.
Number of film processed
- B.
Care in preparation of solutions
- C.
Type of safelight filter used
- D.
Age of solutions
- E.
Proper care and maintenance of the automatic processor
Correct Answer
C. Type of safelight filter usedExplanation
The type of safelight filter used does not affect the life of the processing solutions. The factors that can affect the life of the processing solutions include the number of films processed, care in preparation of solutions, age of solutions, and proper care and maintenance of the automatic processor.Rate this question:
-
- 24.
Any leaks of white light into the darkroom will cause:
- A.
Film fogging
- B.
Film reticulation
- C.
Overdeveloped films
- D.
Underexposed films
- E.
All of the above
Correct Answer
A. Film foggingExplanation
Any leaks of white light into the darkroom will cause film fogging. Film fogging refers to the unwanted exposure of the film to light, which can result in a loss of image quality, reduced contrast, and overall degradation of the final photograph. This can occur when the film is exposed to light during the development process or when the film is improperly stored or handled.Rate this question:
-
- 25.
Which of the following appears most radiolucent on a radiograph
- A.
Bone
- B.
Enamel
- C.
Dentin
- D.
Air space
Correct Answer
D. Air spaceExplanation
Air space appears most radiolucent on a radiograph because it allows the X-rays to pass through easily, resulting in a darker area on the image. In contrast, bone, enamel, and dentin are denser and absorb more X-rays, appearing more radiopaque on the radiograph.Rate this question:
-
- 26.
Increasing which of these four exposure controls will increase the intensity of the x-ray beam: (1) kilovoltage, (2) milliamperage, (3) exposure time, (4) source to source distance?
- A.
1 and 2
- B.
2 and 3
- C.
1, 2, and 3
- D.
1, 2, 3, and 4
Correct Answer
C. 1, 2, and 3Explanation
Kilovoltage (kVp), milliamperage (mA), and exposure time (s) directly influence x-ray beam intensity. Increasing kVp raises the energy and penetrating power of the x-rays, leading to higher intensity. Milliamperage controls the number of electrons produced in the x-ray tube, so increasing mA directly increases the quantity of x-rays and thus the intensity. Exposure time determines how long the x-ray tube produces radiation; a longer exposure time translates to more x-rays and a higher intensity. Source to image distance (SID) follows the inverse square law, so increasing SID actually decreases intensity.Rate this question:
-
- 27.
The speed of a film is determined by the size of the silver halide crystals in the emulsion. Identify the true statement:
- A.
The larger the crystals, faster the film speed
- B.
The larger the crystals, slower the film speed
- C.
The smaller the crystals, the faster the film speed
- D.
None of the above is correct
Correct Answer
A. The larger the crystals, faster the film speedExplanation
The size of the silver halide crystals in the emulsion determines the speed of a film. Larger crystals allow more light to be captured, resulting in a faster film speed. This is because larger crystals have a greater surface area, allowing them to react more quickly to light. Therefore, the statement "the larger the crystals, faster the film speed" is true.Rate this question:
-
- 28.
The safelight must be placed a minimum of what distance from the film and the work area?
- A.
1 foot
- B.
2 feet
- C.
3 feet
- D.
4 feet
- E.
5 feet
Correct Answer
D. 4 feetExplanation
The safelight must be placed a minimum of 4 feet from the film and the work area to ensure that the light emitted by the safelight does not affect the film during processing. Placing the safelight at a greater distance helps to minimize the risk of fogging or unwanted exposure on the film.Rate this question:
-
- 29.
A radiograph that has many light and dark areas with few shades of gray is said to have:
- A.
High density
- B.
Low density
- C.
High contrast
- D.
Low contrast
Correct Answer
C. High contrastExplanation
A radiograph with many light and dark areas and few shades of gray indicates a high contrast. High contrast means that there is a significant difference between the light and dark areas, resulting in a clear distinction between the different structures or tissues being imaged. This can be useful in identifying abnormalities or specific features in the radiograph.Rate this question:
-
- 30.
An example of a radiopaque structure seen on a dental x-rays is
- A.
Bone
- B.
Enamel
- C.
Dentin
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
All of the options listed (bone, enamel, dentin) are examples of radiopaque structures that can be seen on dental x-rays. Radiopaque structures appear white or light gray on the x-ray image because they absorb more x-ray radiation. Bone, enamel, and dentin are all dense structures that have a high degree of radiopacity, making them easily visible on dental x-rays.Rate this question:
-
- 31.
A replenisher is added to the processing solution to
- A.
Compensate for the loss of volume of solutions
- B.
Ensure uniform results between solution changes
- C.
Compensate for the loss of volume of solution
- D.
Compensate for oxidation
- E.
All of the above
Correct Answer
E. All of the aboveExplanation
A replenisher is added to the processing solution to compensate for the loss of volume of solutions, ensure uniform results between solution changes, and compensate for oxidation. This means that the replenisher serves multiple purposes, including replacing lost volume, maintaining consistent results, and preventing oxidation.Rate this question:
-
- 32.
Increasing milliamperage alone results in an image with:
- A.
High contrast
- B.
Low contrast
- C.
Increased density
- D.
Decreased density
Correct Answer
C. Increased densityExplanation
Milliamperage (mA) is one of the factors that affect the exposure of X-rays in radiography. When you increase the milliamperage, it means you are increasing the quantity of X-rays produced. This results in a greater exposure or density in the image, making it darker or denser. It doesn't directly affect contrast; instead, it affects the overall brightness or darkness of the image. Contrast is primarily influenced by other factors like kilovoltage (kVp) and the subject's tissue density.Rate this question:
-
- 33.
Overall blackness or darkness of a dental radiograph is termed
- A.
Density
- B.
Contrast
- C.
Subject thickness
- D.
Diagnostic quality
Correct Answer
A. DensityExplanation
Density refers to the overall blackness or darkness of a dental radiograph. It is determined by the amount of radiation that reaches the film or sensor and is influenced by factors such as exposure time and kilovoltage settings. Higher density indicates a darker image, while lower density indicates a lighter image. Density is an important factor in determining the diagnostic quality of a radiograph as it affects the visibility and clarity of anatomical structures and pathologies.Rate this question:
-
- 34.
Which of the following is the largest intraoral film size?
- A.
Size 4
- B.
Size 3
- C.
Size 2
- D.
Size 1
Correct Answer
A. Size 4Explanation
Size 4 is the largest intraoral film size. Intraoral films are used in dental radiography to capture images of the teeth and surrounding structures. The film size refers to the physical dimensions of the film. Size 4 is larger than size 3, size 2, and size 1, making it the largest option. A larger film size allows for a wider area to be captured in a single image, which can be useful for capturing a full mouth or a panoramic view.Rate this question:
-
- 35.
Which of the following is the location where thermionic emission occurs?
- A.
Positive cathode
- B.
Positive anode
- C.
Negative cathode
- D.
Negative anode
Correct Answer
C. Negative cathodeExplanation
Thermionic emission is the process of electrons being emitted from a heated surface. In this case, the correct answer is "negative cathode" because the cathode is the electrode from which the electrons are emitted. The negative charge on the cathode attracts the positively charged electrons, causing them to be released.Rate this question:
-
- 36.
What year was the radiation control for health & safety act established
- A.
1922
- B.
1991
- C.
1968
- D.
1942
Correct Answer
C. 1968Explanation
The Radiation Control for Health & Safety Act was established in 1968. This act was implemented to regulate the use of radiation and protect the health and safety of individuals from the harmful effects of radiation. It aimed to establish standards for the control of radiation sources, including medical devices and nuclear materials, and to ensure proper training and certification for individuals working with radiation. By setting guidelines and regulations, this act aimed to minimize the risks associated with radiation exposure and promote the safe use of radiation in various industries.Rate this question:
-
- 37.
The latent period in radiation biology time is the time between
- A.
Exposure of film and development
- B.
Subsequent doses of radiation
- C.
Cell rest and cell mitosis
- D.
Exposure to x-radiation and clinical symptoms
- E.
None of the above
Correct Answer
D. Exposure to x-radiation and clinical symptomsExplanation
The latent period in radiation biology refers to the time between exposure to x-radiation and the appearance of clinical symptoms. During this period, no immediate effects or symptoms are observed, even though radiation damage may have occurred. This delay is due to the time required for the biological effects of radiation to manifest and become clinically apparent.Rate this question:
-
- 38.
Which of the following statements is incorrect?
- A.
X-rays travel at the speed of sound
- B.
X-rays have no charge
- C.
X-rays cannot be focused to a point
- D.
X-rays cause ionization
Correct Answer
A. X-rays travel at the speed of soundExplanation
X-rays travel at the speed of light, not at the speed of sound. Sound waves require a medium to travel through, such as air, water, or solids, while X-rays are a form of electromagnetic radiation that can travel through a vacuum. Therefore, it is incorrect to say that X-rays travel at the speed of sound.Rate this question:
-
- 39.
The traditional unit for measuring x-ray exposure in air is termed:
- A.
The gray
- B.
Coulombs per kilogram
- C.
The rem
- D.
The rad
- E.
The roentgen
Correct Answer
E. The roentgenExplanation
The traditional unit for measuring x-ray exposure in air is the roentgen. This unit is used to quantify the amount of ionizing radiation produced by x-rays. It measures the amount of ionization produced in a specific volume of air when exposed to x-rays. The roentgen is commonly used in medical and industrial settings to assess radiation levels and ensure safety standards are met.Rate this question:
-
- 40.
Unopened boxes of radiographic film should not be stored in darkroom because
- A.
Chemical fumes from processing solutions may fog the film
- B.
Continued exposure to the safelight is not recommended
- C.
The box may have a tear that may expose film
- D.
Processing solutions could splash onto the film boxes
- E.
All of the above
Correct Answer
E. All of the aboveExplanation
Unopened boxes of radiographic film should not be stored in the darkroom because there are multiple potential risks. Chemical fumes from processing solutions may fog the film, continued exposure to the safelight is not recommended, the box may have a tear that may expose the film, and processing solutions could splash onto the film boxes. Therefore, it is best to avoid storing unopened boxes of radiographic film in the darkroom to prevent any potential damage or contamination.Rate this question:
-
- 41.
What year did the FDA standardized all manufacturing of radiographic dental equipment?
- A.
1968
- B.
1974
- C.
1991
- D.
1954
Correct Answer
B. 1974Explanation
In 1974, the FDA standardized all manufacturing of radiographic dental equipment. This means that starting from this year, there were specific regulations and guidelines put in place by the FDA to ensure that the manufacturing processes of radiographic dental equipment met certain standards. This standardization aimed to improve the safety and quality of dental equipment used for radiographic imaging procedures.Rate this question:
-
- 42.
The quality factor (QF) is determined by what radiation unit?
- A.
The roentgen
- B.
The rad
- C.
The rem
- D.
The gray
- E.
Coulombs per kilogram
Correct Answer
C. The remExplanation
The quality factor (QF) is a measure of the biological effectiveness of different types of radiation. It takes into account the type and energy of the radiation and how it interacts with human tissues. The rem (Roentgen Equivalent Man) is a unit that incorporates the QF and is used to measure the dose equivalent of radiation. Therefore, the correct answer is "the rem" because it is the unit that determines the quality factor.Rate this question:
-
- 43.
Increasing milliamperage will cause
- A.
Increase in density; image appears darker
- B.
Increase in density; image appears lighter
- C.
Decrease in density; image appears darker
- D.
Decrease in density; image appears lighter
Correct Answer
A. Increase in density; image appears darkerExplanation
Increasing milliamperage will cause an increase in the density of the image, resulting in a darker appearance. Milliamperage refers to the amount of electrical current passing through the X-ray tube, and increasing it leads to more X-ray photons being produced. These additional photons contribute to a higher density in the image, making it appear darker.Rate this question:
-
- 44.
One exposure factor that has a direct influence on the contrast of a dental radiograph is
- A.
Operating kvp
- B.
MA
- C.
Exposure time
- D.
Subject thickness
Correct Answer
A. Operating kvpExplanation
The operating kvp (kilovoltage peak) directly influences the contrast of a dental radiograph. kvp determines the energy of the x-ray photons produced, which affects the ability of the x-rays to penetrate the tissues. Higher kvp values result in more penetration and lower contrast, while lower kvp values result in less penetration and higher contrast. Therefore, the operating kvp setting plays a crucial role in determining the contrast of the dental radiograph.Rate this question:
-
- 45.
Which of the following statements is correct?
- A.
X-rays are a form of electromagnetic radiation; visible light is not
- B.
X-rays have more energy than does visible light
- C.
X-rays have a longer wavelength than does visible light
- D.
X-rays travel more slowly than does visible light
Correct Answer
B. X-rays have more energy than does visible lightExplanation
X-rays have more energy than visible light because they have a shorter wavelength. The energy of electromagnetic radiation is inversely proportional to its wavelength, meaning that shorter wavelengths have higher energy. X-rays have wavelengths in the range of 0.01 to 10 nanometers, while visible light has wavelengths in the range of 400 to 700 nanometers. Therefore, X-rays have higher energy than visible light.Rate this question:
-
- 46.
Increasing operating kilovoltage peak will cause
- A.
Increase in density; image appears darker
- B.
Increase in density: image appears lighter
- C.
Decrease in density; image appears darker
- D.
Decrease in density; image appears lighter
Correct Answer
A. Increase in density; image appears darkerExplanation
Increasing the operating kilovoltage peak in radiography causes an increase in density, resulting in a darker image. This is because higher kilovoltage peak allows more X-rays to penetrate the object being imaged, resulting in increased exposure and darker areas on the image.Rate this question:
-
- 47.
4 basic components of film composition
Correct Answer
film base, adhesive layer, film emulsion, protective layerExplanation
The correct answer for the question is "film base, adhesive layer, film emulsion, protective layer." These four components are essential in film composition. The film base provides a stable support for the emulsion and protects it from damage. The adhesive layer helps to bond the emulsion to the film base. The film emulsion contains light-sensitive chemicals that capture the image. Lastly, the protective layer safeguards the emulsion from scratches and other external factors.Rate this question:
- 48.
Which act requires education and certification of persons using radiographic equipment
- A.
Radiation control for health and safety act
- B.
Consumer patient radiation health and safety act
- C.
None of the above
Correct Answer
B. Consumer patient radiation health and safety actExplanation
The correct answer is the Consumer Patient Radiation Health and Safety Act. This act requires education and certification of persons using radiographic equipment. It is specifically designed to ensure the safety and health of consumers and patients when it comes to radiation exposure. This act aims to regulate the use of radiographic equipment and ensure that only trained and certified individuals handle such equipment, reducing the risk of radiation-related accidents and ensuring proper safety measures are followed.Rate this question:
-
- 49.
Increasing exposure time will cause
- A.
Increase in density; image appears darker
- B.
Increase in density; image appears lighter
- C.
Decrease in density; image appears darker
- D.
Decrease in density; image appears lighter
Correct Answer
A. Increase in density; image appears darkerExplanation
Increasing exposure time refers to the amount of time the camera's sensor is exposed to light when taking a photograph. When the exposure time is increased, more light is allowed to enter the sensor, resulting in a higher density of the image. This increased density causes the image to appear darker because there is more overall darkness in the image due to the longer exposure time.Rate this question:
-
- 50.
The length of the position-indicated device is changed from 16 inches to 8 inches. The resultant intensity of the beam will be:
- A.
Four times as intense
- B.
Twice as intense
- C.
Half as intense
- D.
One fourth as intense
Correct Answer
A. Four times as intenseExplanation
The intensity of a beam of light is inversely proportional to the square of the distance from the source. This relationship is described by the inverse square law.
So, if the length of the position-indicated device is changed from 16 inches to 8 inches, the resultant intensity of the beam will increase.
The inverse square law can be expressed as:
I1 / I2 = (D2 / D1)^2
Where:
I1 is the initial intensity (at 16 inches).
I2 is the final intensity (at 8 inches).
D1 is the initial distance (16 inches).
D2 is the final distance (8 inches).
In this case, if we plug in the values:
I1 / I2 = (16 / 8)^2 = 2^2 = 4
So, the resultant intensity of the beam will be 4 times greater when the distance is reduced from 16 inches to 8 inches.Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Feb 06, 2025Quiz Edited by
ProProfs Editorial Team -
Aug 18, 2013Quiz Created by
Mondu192
Back to top