Summary Robinson Essentials of Dental Assisting 6th Edition Test Bank

Radiographic Imaging and Exposure 6th Edition by Terri L.
Fauber Full Test Bank
Chapter 01: Radiation and Its Discovery
Fauber: Radiographic Imaging and Exposure, 6th Edition



MULTIPLE CHOICE

1. When were x-rays discovered?


a. October 8, 1985
b. November 8, 1895
c. January 23, 1896
d. August 15, 1902
ANS: B
X-rays were discovered by Wilhelm Conrad Roentgen on November 8, 1895.

2. What type of tube was Roentgen working with in his lab when x-rays were discovered?
a. Crookes tube
b. Fluorescent tube
c. High-vacuum tube
d. Wurzburg tube

ANS: A
Roentgen was working with a low-vacuum tube known as a Crookes tube.

3. Which of the following terms could be defined as the instantaneous production of light only during an
interaction between a type of energy and some element or compound?
a. Phosphorescence
b. Afterglow
c. Glowing
d. Fluorescence
ANS: D
Fluorescence is the instantaneous emission of light from a material due to the interaction with some
type of energy.

4. Barium platinocyanide was the:
a. type of dark paper Roentgen used to darken his laboratory.
b. material Roentgen used to produce the first radiograph of his wife’s hand.
c. metal used to produce the low-vacuum tube.
d. fluorescent material that glowed when the tube was energized.
ANS: D

, A piece of paper coated with barium platinocyanide glowed each time Roentgen energized his tube.

5. The first radiograph produced by Roentgen, of his wife’s hand, required an exposure time of:
a. 15 s.
b. 150 s.
c. 15 min.
d. 150 min.
ANS: C
It took a 15-min exposure time to produce the first radiograph.

6. The letter x in x-ray is the symbol for:
a. electricity.
b. the unknown.
c. penetrating.
d. discovery.
ANS: B
The letter x represents the mathematical symbol of the unknown.

7. The first Nobel Prize for physics was received in 1901 by:
a. Marie Curie.
b. William Crookes.
c. Wilhelm Roentgen.
d. Albert Einstein.
ANS: C
Wilhelm Roentgen received the first Nobel Prize for physics in 1901.

8. X-rays were at one time called:
a. Becquerel rays.
b. Roentgen rays.
c. Z-rays.
d. gamma rays.
ANS: B
X-rays were at one time called Roentgen rays.

9. Erythema, an early sign of biologic damage due to x-ray exposure, is:
a. reddening of the skin.
b. a malignant tumor.
c. a chromosomal change.
d. one of the most serious effects of x-ray exposure.
ANS: A
Erythema is reddening and burning of the skin, an early and less serious effect of exposure to large
doses of x-radiation.

10. X-rays have which of the following properties?
a. Electrical and magnetic

, b. Electrical and chemical
c. Magnetic and chemical
d. All options are correct.
ANS: A
X-rays, a type of electromagnetic radiation, have both electrical and magnetic properties.

11. The distance between two successive crests of a sine wave is known as:
a. an angstrom.
b. frequency.
c. the Greek letter nu.
d. wavelength

ANS: D
The distance between two successive crests or troughs of a sine wave is the measure of its wavelength.

12. X-rays used in radiography have wavelengths that are measured in:
a. angstroms.
b. millimeters.
c. centimeters.
d. hertz.

ANS: A
X-rays in the range used in radiography have wavelengths that are so short that they are measured in
angstroms.

13. The frequency of a wave is the number of waves passing a given point per given unit of time.
Frequency is measured in:
a. angstroms.
b. hertz.
c. inches.
d. eV.
ANS: B
The unit of frequency is hertz. The frequency of x-rays in the radiography range varies from about 3 
1019 to 3  1018 Hz.

14. Which of the following is a correct description of the relationship between the wavelength and
frequency of the x-ray photon?
a. Wavelength and frequency are directly proportional.
b. Wavelength and frequency are inversely related by the square root of lambda.
c. Frequency and wavelength are inversely related.
d. Wavelength and frequency have no relationship to each other.
ANS: C
Wavelength and frequency are inversely related; as one increases, the other decreases.

15. A _____ is a small, discrete bundle of energy.
a. phaser
b. quark

, c. photon
d. mesion
ANS: C
A photon, or quantum, is a small, discrete bundle of energy.

16. The speed of light is:
a. 3 a. 3 x 108 meters per second and 3  108 miles per second
b. 3  108 meters per second and 186,000 miles per second
c. 3  108 miles per second and 186,000 miles per second
d. All options are correct.
ANS: B
The speed of light can be described as either 3  108 meters per second or 186,000 miles per second.

17. When first developed, the branch of medicine using x-rays was called:
a. radiology.
b. radiography.
c. roentgenology.
d. imaging sciences.
ANS: C
What we now call radiology was first called roentgenology.

18. The electrical energy applied to an x-ray tube will be transformed to:
a. heat and x-rays
b. heat and light
c. x-rays and light
d. All options are correct.
ANS: A
The electrical energy applied to the x-ray tube will be transformed into heat (primarily) and x-rays.

19. The Greek symbol lambda () represents the x-ray’s:
a. wavelength.
b. speed.
c. frequency.
d. quantity.
ANS: A
Lambda () is the Greek symbol that represents wavelength.

20. An angstrom (Å) is equal to:
a. 101 meter
b. 1010 meter
c. 101 foot
d. 1010 foot

ANS: B
One angstrom is equal to 1010 meter.