,DOWNLOAD THE Test Bank for Dental Radiography 6th Edition Iannucci
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Chapter 02: Radiation Physics
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Iannucci: Dental Radiography, 6th Edition
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MULTIPLE CHOICE 9
1. The fundamental unit of matter is the
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a. proton.
b. neutron.
c. electron.
d. atom.
ANS: D 9
A proton is a subatomic particle. A neutron is a subatomic particle. An electron is a subatomic parti
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cle. The fundamental unit of matter is the atom.
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DIF: Recall REF: Page 7 OBJ: 1 99 9 9 9
TOP: CDA, RHS, III.B.2. Describe the characteristics of x-radiation
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MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of Radiophysics and
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Radiobiology
9
2. The nucleus of an atom contains
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a. protons.
b. neutrons.
c. protons and neutrons. 9 9
d. electrons.
ANS: C 9
The nucleus of an atom contains neutrons as well as protons. The nucleus of an atom contains prot
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ons as well as neutrons. The nucleus of an atom contains protons and neutrons. The nucleus of an
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atom does not contain electrons; it contains protons and neutrons.
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DIF: Recall REF: Page 7 OBJ: 2 99 9 9 9
TOP: CDA, RHS, III.B.2. Describe the characteristics of x-radiation
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MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of Radiophysics and
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Radiobiology
9
3. Which subatomic particle carries a negative electrical charge?
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a. A neutron 9
b. A proton 9
c. An electron 9
d. A nucleon 9
ANS: C 9
A neutron does not carry an electrical charge. A proton carries a positive electrical charge. An elect
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ron carries a negative electrical charge. A nucleon carries a positive (proton) or no (neutron) electr
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ical charge.9
DIF: Comprehension REF: Page 7 9 9
OBJ: 2 TOP: CDA, RHS, III.B.2. Describe the characteristics of x-
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radiation
MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of Radiophysics and
9 9 9 9 9 9 9 9 9 9 9 9 9
9Radiobiology
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,DOWNLOAD THE Test Bank for Dental Radiography 6th Edition Iannucci
9 9 9 9 9 9 9 9 9
4. Which of the following elements is the simplest atom?
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a. Hydrogen (H #1) 9 9
b. Helium (He #2) 9 9
c. Nitrogen (N #7) 9 9
d. Oxygen (O #8) 9 9
ANS: A 9
Atomic numbers are assigned from simplest to most complex. Hydrogen is the simplest atom; with
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a single proton, it has an atomic number of 1. Helium has an atomic number of 2.
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Nitrogen has an atomic number of 7. Oxygen has an atomic number of 8.
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DIF: Comprehension REF: Page 7 9 9
OBJ: 2 TOP: CDA, RHS, III.B.2. Describe the characteristics of x-
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radiation
MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of Radiophysics and
9 9 9 9 9 9 9 9 9 9 9 9 9
9Radiobiology
5. Which of the following statements is true of orbits or shells in the atom?
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a. Protons travel around the nucleus in well-defined shells.
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b. An atom contains innumerable shells.
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c. The energy level within each shell is the same.
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d. The orbiting shell closest to the nucleus has the highest energy level.
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ANS: D 9
Electrons travel around the nucleus in well-
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defined shells. An atom contains a maximum of seven shells. Each of the maximum seven shells w
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ithin an atom represents a different energy level. The orbiting shell closest to the nucleus has the hi
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ghest energy level. The K shell is the orbiting shell closest to the nucleus.
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DIF: Comprehension REF: Page 7 9 9
OBJ: 2 TOP: CDA, RHS, III.B.2. Describe the characteristics of x-
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radiation
MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of Radiophysics and
9 9 9 9 9 9 9 9 9 9 9 9 9
9Radiobiology
6. The binding energy or binding force of an electron is
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a. determined by the distance between the neutrons and protons within the nucleus.
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b. determined by the distance between the orbiting electrons and the nucleus.
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c. weaker for electrons located in inner shells than in outer shells.
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d. determined by the atomic number. 9 9 9 9
ANS: B 9
The binding energy or binding force of an electron is not determined by the distance between the
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neutrons and protons within the nucleus. The binding energy or binding force of an electron is det
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ermined by the distance between the nucleus and the orbiting electrons and is different for each s
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hell. The binding energy or binding force of an electron is stronger for electrons located in inner s
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hells than for outer shells. The binding energy is not determined by the atomic number.
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DIF: Recall REF: Page 7 OBJ: 2 TOP: CDA, N/A 99 9 9 9 9 9
MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of Radiophysics and
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Radiobiology
9
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, DOWNLOAD THE Test Bank for Dental Radiography 6th Edition Iannucci
9 9 9 9 9 9 9 9 9
7. Which of the following statements is true of ionization?
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a. An atom that gains an electron will have a negative charge.
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b. An atom that loses an electron will have a negative charge.
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c. An atom that loses an electron will have a positive charge.
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d. An atom that gains an electron has a negative charge, and an atom that loses an ele
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ctron has a positive charge.9 9 9 9
ANS: D 9
This answer is not the best answer. An atom that gains an electron has a negative charge; however
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, an atom that loses an electron has a positive charge. An atom that loses an electron will have a po
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sitive charge. An atom that loses an electron has a positive charge; however, an atom that gains an
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9electron has a negative charge. An atom that gains an electron will have a negative charge, and a
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n atom that loses an electron will have a positive charge. An atom that gains or loses an electron a
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nd becomes electrically unbalanced is known as an ion.
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DIF: Comprehension REF: Page 9 9 9
OBJ: 3 TOP: CDA, N/A 9 9 9 9
MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of Radiophysics and
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Radiobiology
9
8. An ion pair results when
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a. a proton is removed from an atom.
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b. an electron is removed from an atom.9 9 9 9 9 9
c. a neutron is removed from an atom.
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d. two atoms share a pair of electrons. 9 9 9 9 9 9
ANS: B 9
An ion pair results when an electron is removed from an atom rather than a proton. When an electr
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on is removed from an atom in the ionization process, an ion pair results. The atom becomes the p
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ositive ion, and the ejected electron becomes the negative ion. An ion pair results when an electro
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n is removed from an atom rather than a neutron. A molecule occurs when two atoms share a pair
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of electrons.
9
DIF: Recall REF: Page 9 OBJ: 3 99 9 9 9
TOP: CDA, RHS, III.B.2. Describe the characteristics of x-radiation
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MSC: NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of Radiophysics and
9 9 9 9 9 9 9 9 9 9 9 9 9
Radiobiology
9
9. (1) Radiation is the emission and propagation of energy through space or a substance in the form
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of waves or particles. (2) Radioactivity can be defined as the process by which certain unstable at
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oms or elements undergo spontaneous disintegration, or decay, in an effort to attain a more balan
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ced nuclear state. 9 9
a. Both statements are true. 9 9 9
b. Both statements are false. 9 9 9
c. The first statement is true; the second statement is false.
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d. The first statement is false; the second statement is true.
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ANS: A 9
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