HW3 (solutions) - myers (nmm698) H03: Atomic Theory 1...

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Unformatted text preview: myers (nmm698) H03: Atomic Theory 1 Mccord (50970) 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. ultraviolet radiatioin, visible light, in- frared radiation, radio waves correct 2. radio waves, visible light, ultraviolet radi- ation, infrared radiation 3. infrared radiation, radio waves, visible light, ultraviolet radiation 4. visible light, ultraviolet radiation, in- frared radiation, radio waves 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 . 03 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 426 . 743 nm. Explanation: = 7 . 03 10 14 Hz c = 3 10 8 m / s c = = c = 3 10 8 m / s 7 . 03 10 14 s- 1 = 4 . 26743 10- 7 m 10 9 nm 1 m = 426 . 743 nm 003 (part 2 of 2) 10.0 points When an electron beam strikes a block of copper, x-rays of frequency 2 . 45 10 19 Hz are emitted. What is the wavelength of these x-rays? Correct answer: 12 . 2449 pm. Explanation: = 2 . 45 10 19 Hz = c = 3 10 8 m / s 2 . 45 10 19 s- 1 = 1 . 22449 10- 11 m 10 12 pm 1 m = 12 . 2449 pm 004 10.0 points What kind of radiation causes molecules to vibrate? 1. ultraviolet 2. visible 3. microwave 4. infrared correct 5. x-rays Explanation: 005 (part 1 of 3) 10.0 points Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 560 nm. How much energy is emitted by an excited sodium atom when it generates a photon? Correct answer: 3 . 54964 10- 19 J. Explanation: = 560 nm = 5 . 6 10- 7 m c = , so E = h = hc = 6 . 626 10- 34 J s 5 . 6 10- 7 m (3 10 8 m / s) = 3 . 54964 10- 19 J myers (nmm698) H03: Atomic Theory 1 Mccord (50970) 2 006 (part 2 of 3) 10.0 points How much energy is emitted by 14 . 1 mg of sodium atoms emitting light at this wave- length? Correct answer: 131 . 101 J. Explanation: mass = 14 . 1 mg = 0 . 0141 g E = . 0141 g Na 22 . 99 g / mol Na (6 . 022 10 23 atoms / mol) (3 . 54964 10- 19 J / atom) = 131 . 101 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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HW3 (solutions) - myers (nmm698) H03: Atomic Theory 1...

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