HW 3 - johnson (mjj622) H03: Atomic Theory 1 Mccord (50970)...

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Unformatted text preview: johnson (mjj622) 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 increasing fre- quency? 1. radio waves, infrared radiation, visible light, ultraviolet radiation correct 2. radio waves, infrared radiation, ultravio- let radiation, visible light 3. infrared radiation, radio waves, visible light, ultraviolet radiation 4. radio waves, visible light, ultraviolet radi- ation, infrared radiation 5. ultraviolet radiation, visible light, in- frared radiation, radio waves Explanation: radio waves < infrared radiation < visible light < ultraviolet radiation 002 (part 1 of 2) 10.0 points Light with a frequency of 7 . 32 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 409 . 836 nm. Explanation: = 7 . 32 10 14 Hz c = 3 10 8 m / s c = = c = 3 10 8 m / s 7 . 32 10 14 s- 1 = 4 . 09836 10- 7 m 10 9 nm 1 m = 409 . 836 nm 003 (part 2 of 2) 10.0 points When an electron beam strikes a block of copper, x-rays of frequency 7 . 2 10 18 Hz are emitted. What is the wavelength of these x-rays? Correct answer: 41 . 6667 pm. Explanation: = 7 . 2 10 18 Hz = c = 3 10 8 m / s 7 . 2 10 18 s- 1 = 4 . 16667 10- 11 m 10 12 pm 1 m = 41 . 6667 pm 004 10.0 points What kind of radiation causes molecules to vibrate? 1. microwave 2. infrared correct 3. x-rays 4. ultraviolet 5. visible 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 = hc = 6 . 626 10- 34 J s 5 . 8 10- 7 m (3 10 8 m / s) = 3 . 42724 10- 19 J johnson (mjj622) H03: Atomic Theory 1 Mccord (50970) 2 006 (part 2 of 3) 10.0 points How much energy is emitted by 28 . 8 mg of sodium atoms emitting light at this wave- length? Correct answer: 258 . 547 J. Explanation: mass = 28 . 8 mg = 0 . 0288 g E = . 0288 g Na 22 . 99 g / mol Na (6 . 022 10 23 atoms / mol) (3 . 42724 10- 19 J / atom) = 258 . 547 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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HW 3 - johnson (mjj622) H03: Atomic Theory 1 Mccord (50970)...

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