H03- Atomic Theory 1-solutions

H03- Atomic Theory 1-solutions - phan (dtp377) H03: Atomic...

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Unformatted text preview: phan (dtp377) H03: Atomic Theory 1 mccord (51600) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points What is the correct order of decreasing fre- quency? 1. visible light, ultraviolet radiation, in- frared radiation, radio waves 2. radio waves, visible light, ultraviolet radi- ation, infrared radiation 3. ultraviolet radiation, visible light, in- frared radiation, radio waves correct 4. infrared radiation, radio waves, visible light, ultraviolet radiation 5. radio waves, infrared radiation, visible light, ultraviolet radiation Explanation: ultraviolet radiation > visible light > infrared radiation > radio waves 002 (part 1 of 2) 10.0 points Light with a frequency of 7 . 34 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 408 . 719 nm. Explanation: = 7 . 34 10 14 Hz c = 3 10 8 m / s c = = c = 3 10 8 m / s 7 . 34 10 14 s- 1 = 4 . 08719 10- 7 m 10 9 nm 1 m = 408 . 719 nm 003 (part 2 of 2) 10.0 points When an electron beam strikes a block of copper, x-rays of frequency 1 . 91 10 19 Hz are emitted. What is the wavelength of these x-rays? Correct answer: 15 . 7068 pm. Explanation: = 1 . 91 10 19 Hz = c = 3 10 8 m / s 1 . 91 10 19 s- 1 = 1 . 57068 10- 11 m 10 12 pm 1 m = 15 . 7068 pm 004 10.0 points What kind of radiation causes molecules to vibrate? 1. ultraviolet 2. x-rays 3. microwave 4. visible 5. infrared correct Explanation: 005 (part 1 of 3) 10.0 points Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 580 nm. How much energy is emitted by an excited sodium atom when it generates a photon? Correct answer: 3 . 42724 10- 19 J. Explanation: = 580 nm = 5 . 8 10- 7 m c = , so E = h = h c = 6 . 626 10- 34 J s 5 . 8 10- 7 m (3 10 8 m / s) = 3 . 42724 10- 19 J phan (dtp377) H03: Atomic Theory 1 mccord (51600) 2 006 (part 2 of 3) 10.0 points How much energy is emitted by 20 . 4 mg of sodium atoms emitting light at this wave- length? Correct answer: 183 . 137 J. Explanation: mass = 20 . 4 mg = 0 . 0204 g E = . 0204 g Na 22 . 99 g / mol Na (6 . 022 10 23 atoms / mol) (3 . 42724 10- 19 J / atom) = 183 . 137 J 007 (part 3 of 3) 10.0 points How much energy is emitted by 1 mol of sodium ions emitting light at this wavelength?sodium ions emitting light at this wavelength?...
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H03- Atomic Theory 1-solutions - phan (dtp377) H03: Atomic...

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