Chapter 02: Radiation Physics
Iannucci: Dental Radiography, 5th Edition
MULTIPLE CHOICE
1. The fundamental unit of matter is the
a. proton.
b.
... [Show More] neutron.
c. electron.
d. atom.
ANS: D
A proton is a subatomic particle; the fundamental unit of matter is the atom. A neutron is a
subatomic particle; the fundamental unit of matter is the atom. An electron is a subatomic
particle; the fundamental unit of matter is the atom. The fundamental unit of matter is the
atom.
DIF: Recall REF: Page 8 OBJ: 1
TOP: CDA, RHS, III.B.2. Describe the characteristics of x-radiation
MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of radiophysics
and radiobiology
2. The nucleus of an atom contains
a. protons.
b. neutrons.
c. protons and neutrons.
d. electrons.
ANS: C
The nucleus of an atom contains neutrons as well as protons. The nucleus of an atom contains
protons as well as neutrons. The nucleus of an atom contains protons and neutrons. The
nucleus of an atom does not contain electrons; it contains protons and neutrons.
DIF: Recall REF: Page 8 OBJ: 2
TOP: CDA, RHS, III.B.2. Describe the characteristics of x-radiation
MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of radiophysics
and radiobiology
3. Which subatomic particle carries a negative electrical charge?
a. A neutron
b. A proton
c. An electron
d. A nucleon
ANS: C
A neutron does not carry an electrical charge. A proton carries a positive electrical charge. An
electron carries a negative electrical charge. A nucleon carries a positive (proton) or no
(neutron) electrical charge.
DIF: Comprehension REF: Page 8 OBJ: 2
TOP: CDA, RHS, III.B.2. Describe the characteristics of x-radiationDental Radiography 5th Edition Iannucci Test Bank
N R I G B.C M
MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of radiophysics
and radiobiology
4. Which of the following elements is the simplest atom?
a. Hydrogen (H #1)
b. Helium (He #2)
c. Nitrogen (N #7)
d. Oxygen (O #8)
ANS: A
Atomic numbers are assigned from simplest to most complex. Hydrogen is the simplest atom;
with a single proton, it has an atomic number of 1. Helium has an atomic number of 2.
Nitrogen has an atomic number of 7. Oxygen has an atomic number of 8. [Show Less]