Test Bank for Radiologic Science for
Technologists 13th Edition (Mosby,
2025) by Bushong and Shields,
PRACTICE QUESTIONS |ORIGINAL
QUESTIONS & ANSWERS |DETAILED
RATIONALES |HINTED COMPLETE
EXAM PREP GRADED A+*INSTANT
DOWNLOAD PDF
Section I — Radiation Physics and Basic Concepts
,1. Which scientist is credited with discovering x-rays in 1895?
A. Henri Becquerel
B. Marie Curie
C. Wilhelm Conrad Roentgen
D. Thomas Edison
Answer: C. Wilhelm Conrad Roentgen
Rationale: Roentgen discovered x-rays in 1895 while experimenting
with cathode-ray tubes.
2. What is the SI unit of absorbed radiation dose?
A. Sievert
B. Gray
C. Coulomb
D. Becquerel
Answer: B. Gray
Rationale: The gray (Gy) is the SI unit for absorbed dose.
3. Which unit is used to express equivalent or effective dose?
A. Gray
B. Sievert
C. Roentgen
D. Coulomb/kg
Answer: B. Sievert
Rationale: The sievert accounts for radiation type and, for effective
dose, tissue weighting.
4. X-rays are classified as which type of radiation?
A. Particulate radiation
B. Acoustic radiation
C. Electromagnetic radiation
D. Mechanical radiation
,Answer: C. Electromagnetic radiation
Rationale: X-rays are electromagnetic photons and have no rest mass
or electrical charge.
5. Which characteristic distinguishes electromagnetic radiation
from particulate radiation?
A. Electromagnetic radiation has rest mass
B. Electromagnetic radiation travels as photons
C. Electromagnetic radiation always has a positive charge
D. Electromagnetic radiation cannot travel through a vacuum
Answer: B. Electromagnetic radiation travels as photons
Rationale: Electromagnetic radiation consists of photons and can
propagate through a vacuum.
6. Which equation represents the relationship between photon
energy, frequency, and Planck's constant?
A. E = mc²
B. E = hf
C. F = ma
D. P = IV
Answer: B. E = hf
Rationale: Photon energy is proportional to frequency according to E
= hf.
7. If photon frequency increases, photon energy:
A. Decreases
B. Remains constant
C. Increases
D. Becomes zero
Answer: C. Increases
, Rationale: Because E = hf, photon energy increases directly with
frequency.
8. What happens to wavelength when frequency increases?
A. It increases
B. It decreases
C. It remains unchanged
D. It becomes infinite
Answer: B. It decreases
Rationale: Frequency and wavelength are inversely proportional.
9. What is the approximate speed of electromagnetic radiation in a
vacuum?
A. 3 × 10⁶ m/s
B. 3 × 10⁷ m/s
C. 3 × 10⁸ m/s
D. 3 × 10⁹ m/s
Answer: C. 3 × 10⁸ m/s
Rationale: Electromagnetic radiation travels at approximately 3 × 10⁸
m/s in a vacuum.
10. Which electromagnetic radiation has the shortest wavelength?
A. Radio waves
B. Infrared
C. Visible light
D. X-rays
Answer: D. X-rays
Rationale: X-rays have much shorter wavelengths than visible,
infrared, and radio waves.
11. Which factor primarily determines the energy of an x-ray
photon?
Technologists 13th Edition (Mosby,
2025) by Bushong and Shields,
PRACTICE QUESTIONS |ORIGINAL
QUESTIONS & ANSWERS |DETAILED
RATIONALES |HINTED COMPLETE
EXAM PREP GRADED A+*INSTANT
DOWNLOAD PDF
Section I — Radiation Physics and Basic Concepts
,1. Which scientist is credited with discovering x-rays in 1895?
A. Henri Becquerel
B. Marie Curie
C. Wilhelm Conrad Roentgen
D. Thomas Edison
Answer: C. Wilhelm Conrad Roentgen
Rationale: Roentgen discovered x-rays in 1895 while experimenting
with cathode-ray tubes.
2. What is the SI unit of absorbed radiation dose?
A. Sievert
B. Gray
C. Coulomb
D. Becquerel
Answer: B. Gray
Rationale: The gray (Gy) is the SI unit for absorbed dose.
3. Which unit is used to express equivalent or effective dose?
A. Gray
B. Sievert
C. Roentgen
D. Coulomb/kg
Answer: B. Sievert
Rationale: The sievert accounts for radiation type and, for effective
dose, tissue weighting.
4. X-rays are classified as which type of radiation?
A. Particulate radiation
B. Acoustic radiation
C. Electromagnetic radiation
D. Mechanical radiation
,Answer: C. Electromagnetic radiation
Rationale: X-rays are electromagnetic photons and have no rest mass
or electrical charge.
5. Which characteristic distinguishes electromagnetic radiation
from particulate radiation?
A. Electromagnetic radiation has rest mass
B. Electromagnetic radiation travels as photons
C. Electromagnetic radiation always has a positive charge
D. Electromagnetic radiation cannot travel through a vacuum
Answer: B. Electromagnetic radiation travels as photons
Rationale: Electromagnetic radiation consists of photons and can
propagate through a vacuum.
6. Which equation represents the relationship between photon
energy, frequency, and Planck's constant?
A. E = mc²
B. E = hf
C. F = ma
D. P = IV
Answer: B. E = hf
Rationale: Photon energy is proportional to frequency according to E
= hf.
7. If photon frequency increases, photon energy:
A. Decreases
B. Remains constant
C. Increases
D. Becomes zero
Answer: C. Increases
, Rationale: Because E = hf, photon energy increases directly with
frequency.
8. What happens to wavelength when frequency increases?
A. It increases
B. It decreases
C. It remains unchanged
D. It becomes infinite
Answer: B. It decreases
Rationale: Frequency and wavelength are inversely proportional.
9. What is the approximate speed of electromagnetic radiation in a
vacuum?
A. 3 × 10⁶ m/s
B. 3 × 10⁷ m/s
C. 3 × 10⁸ m/s
D. 3 × 10⁹ m/s
Answer: C. 3 × 10⁸ m/s
Rationale: Electromagnetic radiation travels at approximately 3 × 10⁸
m/s in a vacuum.
10. Which electromagnetic radiation has the shortest wavelength?
A. Radio waves
B. Infrared
C. Visible light
D. X-rays
Answer: D. X-rays
Rationale: X-rays have much shorter wavelengths than visible,
infrared, and radio waves.
11. Which factor primarily determines the energy of an x-ray
photon?
