Radiology Physics Chapter 2
14. In a vacuum, electromagnetic radiation a. has a velocity equal to the speed of light. b. x-ray energy may be bent by a crystalline lens. c. causes ionizations of air molecules. d. is altered by a strong magnetic field.
ANS: A
26. If an electron is gained or lost from an atom, that atom becomes a. an ion. c. an isotope. b. a new element. d. unstable.
ANS: A
27. All of the following are energy forms EXCEPT a. sound. c. electrical. b. thermal. d. nuclear.
ANS: A
28. Quarks may behave according to the ____ theory. a. string c. relativity b. quantum d. electromagnetic
ANS: A
8. Groups of the periodic table a. represent elements with the same outer electron configuratio. b. are horizontal. c. represent elements with the same atomic density. d. none of the above
ANS: A
1. The unit of mass is the a. m/sec. c. mm. b. kg. d. cc.
ANS: B
11. In the excitation process, electrons in an atom are moved to a/an ____ energy state. a. lower c. incomplete b. higher d. all of the above
ANS: B
2. An electron is ____ charged and has a mass of ____ amu(s). a. positively; 1 c. neutral; 1 b. negatively; 0.000548 d. positively; 0.000548
ANS: B
20. Calculate the velocity of red light with a wavelength of approximately 4.0 nm (nm = 10-9). a. 7.5 10-1 nm/sec c. 1.2 10-17 nm/sec b. 7.5 1018 nm/sec d. 1.2 101 nm/sec
ANS: B
21. The nuclear particles that distinguish one element from another are the a. neutrons. c. gamma particles. b. protons. d. beta particles.
ANS: B
22. An atom has an atomic number of 18 and a mass number of 38. Letting P = the number of protons and N = the number of neutrons, which of the following atoms is the isotope of this atom? a. P = 18, N = 20 c. P = 20, N = 18 b. P = 18, N = 21 d. none of the above
ANS: B
9. Carbon has an atomic number of 6. One of its isotopes has a mass number of 14. The number of neutrons in this isotope is a. 6. c. 14. b. 8. d. 19.
ANS: B
10. A period in the periodic table is a. represented by a column. b. vertical. c. the principal quantum number. d. determined by the valence electrons.
ANS: C
13. Isotopes have ____ mass numbers and ____ atomic numbers. a. the same; the same c. different; the same b. the same; different d. different; different
ANS: C
16. Electromagnetic radiation with a frequency of 2,000 hertz would have a wavelength of a. 1/2,000 cm. c. 1.5 107 cm. b. 1.5 10-7 cm. d. cannot be determined
ANS: C
17. The atomic number is the number of ____ contained in the nucleus. a. neutrons c. protons b. electrons d. positrons
ANS: C
19. An element with an atomic number of 22 has how many electrons in the second principal quantum number level (L shell)? a. 22 c. 8 b. 10 d. 2
ANS: C
24. According to the "rule of octets" a. eight energy levels have electrons. b. eight protons occupy the outermost shell. c. the valence shell is chemically inert. d. both a and c
ANS: C
30. When comparing iodine (Z=53) with barium (Z=56), a. barium has a lower k-shell binding energy b. iodine has more neutrons. c. iodine has five (5) orbitals with electrons. d. barium has fewer protons.
ANS: C
4. Photon wavelength is a. inversely proportional to photon velocity. b. directly proportional to photon frequency. c. inversely proportional to photon frequency. d. usually designated by the letter c.
ANS: C
5. All of the following are true of electromagnetic energies EXCEPT: a. They are illustrated as sinusoidal waves. b. They possess both wave and particle characteristics. c. The relationship between frequency and wavelength is direct and proportional. d. They are arranged in an orderly spectrum according to frequency and wavelength.
ANS: C
12. The maximum number of electrons in a period with a principal quantum number of 4 is a. 6. c. 18. b. 8. d. 32.
ANS: D
15. If the photon frequency of electromagnetic radiation is increased tenfold, then the a. velocity will increase times 10. b. velocity will decrease to 10. c. wavelength will increase times 10. d. wavelength will decrease to 1/10.
ANS: D
18. An isotope of boron has 5 protons and 6 neutrons. The atomic number of boron is a. 11. c. 6. b. 10. d. 5.
ANS: D
23. If the frequency of a wave is 1,000 hertz and is traveling at 50,000 m/sec, then its wavelength is a. 0.05 m. c. 5 m. b. 0.5 m. d. 50 m.
ANS: D
25. Which of the following is not a basic characteristic of the wave equation? a. velocity c. frequency b. wavelength d. energy
ANS: D
29. All of the following are true of the substance glucose (C6H12O6) EXCEPT: a. The smallest subdivision of this molecule is glucose. b. It is a compound. c. It consists of three elements. d. It may be broken down into one atom of glucose.
ANS: D
3. The orderly arrangement of elements in the periodic table is based upon a. atomic weights. c. neutron number. b. mass number. d. atomic number.
ANS: D
6. The maximum number of electrons found in any energy level (shell) at any point in time is calculated by the formula a. V= I x R. c. N = amu x Z. b. W = F x D. d. 2n2.
ANS: D
7. The sum of protons and neutrons in a nucleus is called the a. electron number. c. quantum number. b. atomic weight. d. mass number.
ANS: D
MATCHING Match the following atomic structure characteristics with the correct statement or definition. a. electron e. kinetic energy b. neutron f. atomic mass c. proton g. atomic number d. binding energy h. isotope 1. entirely concentrated in the nucleus 2. increases as the number of electrons and protons increases 3. A change in the number of these changes the identity of the element. 4. possesses a negative charge and minute mass 5. A gain or loss of this atomic particle creates an isotope. 6. Electrons moving around in specific orbitals demonstrates this energy.
1. ANS: F 2. ANS: D 3. ANS: C 4. ANS: A 5. ANS: B 6. ANS: E
Match the following items relating to the electromagnetic spectrum with the correct statement. a. infrared energy e. excitation b. gamma rays f. lambda c. radio waves g. amplitude d. ultraviolet energy h. velocity 13. the transference of energy to an atom 14. can be long wavelengths in kilometers 15. an expression of wavelength 16. the product of frequency and wavelength 17. expressed as the height of the wave 18. highly penetrating based upon frequency
13. ANS: E 14. ANS: C 15. ANS: F 16. ANS: H 17. ANS: G 18. ANS: B
Match the following items relating to the periodic table with the correct statement. a. tungsten e. barium b. valence f. lead c. molybdenum g. families (groups) d. iodine h. periods 7. elements having the same chemical characteristics 8. Its k-shell binding energy is -33.17 keV. 9. It is determined by the number of electrons in the outermost shell of an atom. 10. It has a mass number of 207. 11. Elements having the same principal quantum number are in this order. 12. an "L" to "K" transition would yield 31.45 keV of energy
7. ANS: G 8. ANS: D 9. ANS: B 10. ANS: F 11. ANS: H 12. ANS: E