Chapter 04: Electromagnetic Energy Bushong: Radiologic Science for
Technologists
MULTIPLE CHOICE
1. The four properties of photons are , , and . a. size; shape; spin;
mass
b. frequency; mass; amplitude; wavelength
c. frequency; wavelength; velocity; amplitude
d. refraction; velocity; spin; amplitude
ANS: C
The properties of photons are frequency, wavelength, velocity, and amplitude.
2. The smallest quantity of any type of electromagnetic radiation is a(n) . a.
photon
b. electron
c. neutrino
d. quark
ANS: A
The smallest quantity of any type of electromagnetic radiation is a photon.
3. What is the velocity of all electromagnetic radiation?
a. 8 103 m/s
b. 2 108 m/s
c. 3 108 m/s
d. 4 103 m/s
ANS: C
The velocity of all electromagnetic radiation is 3 108 m/s.
4. The rate of rise and fall of a sine wave is called its .
a. amplitude
b. frequency
c. wavelength
d. velocity
ANS: B
The rate of rise and fall of a sine wave is called its frequency.
5. A hertz (Hz) is equal to cycle(s) per second.
a. 103
b. 102
, c. 10
d. 1
ANS: D
A hertz is equal to 1 cycle per second.
6. What is the electromagnetic wave equation?
a. c = f
b. c = f/
c. c = fv
d. c = f –
ANS: A
The wave equation is c = f.
7. The of electromagnetic radiation is constant.
a. amplitude
b. velocity
c. frequency
d. wavelength
ANS: B
The velocity of electromagnetic radiation is constant.
8. If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then
its frequency must .
a. double
b. increase four times
c. decrease by half
d. remain constant
ANS: C
If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then
its frequency must decrease by half.
9. The intensity of radiation in proportion to the square of the distance of the
object from the source. a. increases; direct
b. decreases; direct
c. increases; inverse
d. decreases; inverse
ANS: D
The intensity of radiation decreases in inverse proportion to the square of the distance of
the object from the source.
Technologists
MULTIPLE CHOICE
1. The four properties of photons are , , and . a. size; shape; spin;
mass
b. frequency; mass; amplitude; wavelength
c. frequency; wavelength; velocity; amplitude
d. refraction; velocity; spin; amplitude
ANS: C
The properties of photons are frequency, wavelength, velocity, and amplitude.
2. The smallest quantity of any type of electromagnetic radiation is a(n) . a.
photon
b. electron
c. neutrino
d. quark
ANS: A
The smallest quantity of any type of electromagnetic radiation is a photon.
3. What is the velocity of all electromagnetic radiation?
a. 8 103 m/s
b. 2 108 m/s
c. 3 108 m/s
d. 4 103 m/s
ANS: C
The velocity of all electromagnetic radiation is 3 108 m/s.
4. The rate of rise and fall of a sine wave is called its .
a. amplitude
b. frequency
c. wavelength
d. velocity
ANS: B
The rate of rise and fall of a sine wave is called its frequency.
5. A hertz (Hz) is equal to cycle(s) per second.
a. 103
b. 102
, c. 10
d. 1
ANS: D
A hertz is equal to 1 cycle per second.
6. What is the electromagnetic wave equation?
a. c = f
b. c = f/
c. c = fv
d. c = f –
ANS: A
The wave equation is c = f.
7. The of electromagnetic radiation is constant.
a. amplitude
b. velocity
c. frequency
d. wavelength
ANS: B
The velocity of electromagnetic radiation is constant.
8. If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then
its frequency must .
a. double
b. increase four times
c. decrease by half
d. remain constant
ANS: C
If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then
its frequency must decrease by half.
9. The intensity of radiation in proportion to the square of the distance of the
object from the source. a. increases; direct
b. decreases; direct
c. increases; inverse
d. decreases; inverse
ANS: D
The intensity of radiation decreases in inverse proportion to the square of the distance of
the object from the source.
