Chapter 7

# Chapter 7 - Chapter 7 Quantum Theory and the Electronic...

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Page 129 Chapter 7: Quantum Theory and the Electronic Structure of Atoms 1. In the following diagram of a wave A) (a) is amplitude and (b) is wavelength D) (a) is amplitude and (b) is frequency B) (a) is frequency and (b) is amplitude E) (a) is wavelength and (b) is amplitude C) (a) is wavelength and (b) is frequency Ans: E Category: Easy Section: 7.1 2. As the frequency of an electromagnetic wave increases A) its speed must increase. C) its amplitude must increase. B) its wavelength must increase. D) its energy must increase. Ans: D Category: Easy Section: 7.2 3. What is the wavelength of radiation that has a frequency of 5.39 × 10 14 s –1 ? (c = 2.9979 × 10 8 m/s) A) 1.80 × 10 –3 nm B) 556 nm C) 618 nm D) 6180 nm E) 1.61 × 10 23 nm Ans: B Category: Easy Section: 7.1

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Chapter 7: Quantum Theory and the Electronic Structure of Atoms Page 130 4. What is the wavelength of radiation that has a frequency of 2.10 × 10 14 s –1 ? A) 6.30 × 10 22 m D) 1.43 × 10 –6 m B) 7.00 × 10 2 nm E) 3.00 × 10 8 m C) 7.00 × 10 5 m Ans: D Category: Easy Section: 7.1 5. Calculate the frequency of visible light having a wavelength of 486 nm. A) 2.06 × 10 14 /s D) 1.20 × 10 –15 /s B) 2.06 × 10 6 /s E) 4.86 × 10 –7 /s C) 6.17 × 10 14 /s Ans: C Category: Easy Section: 7.1 6. Calculate the frequency of visible light having a wavelength of 686 nm. A) 4.37 × 10 14 /s D) 2.29 × 10 –15 /s B) 4.37 × 10 5 /s E) 2.29 × 10 –6 /s C) 6.17 × 10 14 /s Ans: A Category: Easy Section: 7.1 7. What is the energy in joules of one photon of microwave radiation with a wavelength 0.122 m? (c = 2.9979 × 10 8 m/s; h = 6.626 × 10 –34 J s) A) 2.70 × 10 –43 J D) 4.07 × 10 –10 J B) 5.43 × 10 –33 J E) 2.46 × 10 9 J C) 1.63 × 10 –24 J Ans: C Category: Medium Section: 7.2 8. What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm? A) 6.46 × 10 –16 J D) 12.4 kJ B) 6.46 × 10 –25 J E) 246 kJ C) 2.46 × 10 –4 J Ans: E Category: Medium Section: 7.2 9. What is the energy in joules of a mole of photons associated with red light of wavelength 7.00 × 10 2 nm? A) 256 kJ B) 1.71 × 10 5 J C) 4.72 × 10 –43 J D) 12.4 kJ E) 2.12 × 10 42 J Ans: B Category: Medium Section: 7.2 10. What is the binding energy (in J/mol or kJ/mol) of an electron in a metal whose threshold frequency for photoelectrons is 2.50 × 10 14 /s? A) 99.7 kJ/mol D) 7.22 × 10 17 kJ/mol B) 1.66 × 10 –19 J/mol E) 1.20 × 10 –6 J/mol C) 2.75 × 10 –43 J/mol Ans: A Category: Medium Section: 7.2
Chapter 7: Quantum Theory and the Electronic Structure of Atoms Page 131 11. Complete this sentence: Atoms emit visible and ultraviolet light A) as electrons jump from lower energy levels to higher levels. B)

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Chapter 7 - Chapter 7 Quantum Theory and the Electronic...

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