Review questions 1 Flashcards
Professor Wilhelm Roentgen:
a. Advocated radiology in the United States b. Exposed the first radiographs in the United States c. Discovered the X-ray d. Employed the first dental auxiliary in the United States
C. Discovered the X-ray
The first sign of x-ray dermatitis (poisoning) is
a. alopecia
b. dry skin
c. erythema
d. None of the above
C. erythema
A form of energy is
a. heat
b. light
c. electricity
d. x-radiation
e. all of the above
E. all of the above
Photons are described as:
a. bundles of energy
b. dental film mounts
c. electrically neutral
particles
d. negatively charged atomic
particles
A. Bundles of energy
Limited penetration long- wavelength radiation is known as:
a. short wavelengths
b. hard radiation
c. soft radiation
d. desirable wavelengths
C. Soft radiation
Background radiation originates from:
a. environment
b. outer space
c. radionuclides
d. terrestrial radiation
e. all of the above
f. only a and b
e. all of the above
Ionizing radiation produces ions when:
a. radiation passes through body tissues b. ions compress into the atmosphere c. isotopes flow freely on air d. none of the above
a. radiation passes through body tissues
Common characteristics of radiation are:
a. wavelengths that determine the penetrating power of the energy b. forms of electromagnetic radiation c. the giving off of electrical fields at right angles to the path of travel d. straight lines that travel at 186,000 miles per second e. all of the above
e. all of the above
Hard radiation is considered to be the:
- short wavelengths with great penetrating power
- long wavelengths with limited penetrating power
- type of radiation that is most desirable and capable
of penetrating oral
structures - type of radiation that is
unsuitable for exposing radiographs
a. 1 and 2
b. 2 and 3
c. 1 and 3
d. 2 and 4
C. 1 and 3
1. short wavelengths with great penetrating power
- type of radiation that is most desirable and capable
of penetrating oral
structures
An electron is defined as:
a. anything that occupies space and has mass b. electrically neutral tiny particle c. center of the atom d. negatively charged atomic particle
d. negatively charged atomic particle
What are the properties of electromagnetic radiation?
a. Travels at the speed of light
b. No electrical charge and no mass or weight
c. Measurable energies
d. AandB
e. All of the above
e. All of the above
Ionizing types of radiation include:
a. Gamma rays
b. Cosmic rays
c. X-rays
d. Only A and B
e. All of the above
e. all of the above
X-rays are grouped according to: a. Milliliters
b. Seconds
c. Liters
d. Wavelengths
d. wavelengths
The measurement of the number of oscillations per second of electromagnetic radiation is known as:
a. Crest
b. Wavelength
c. Bremsstrahlung d. Frequency
d. frequency
X-rays characteristically:
a. travel in straight wavelengths
b. are invisible
c. have no mass
d. only B and C
e. All of the above
e. All of the above