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hw 2 answers - Iype Shelby Homework 2 Due midnight Inst...

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Iype, Shelby – Homework 2 – Due: Sep 13 2007, midnight – Inst: Vandenbout 1 This print-out should have 17 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Here’s the first of two homeworks from Chapter 12 in your textbook. 001 (part 1 of 1) 10 points What is the correct order of decreasing fre- quency? 1. radio waves, infrared radiation, visible light, ultraviolet radiation 2. ultraviolet radiatioin, visible light, in- frared radiation, radio waves correct 3. visible light, ultraviolet radiation, in- frared radiation, radio waves 4. radio waves, visible light, ultraviolet radi- ation, infrared radiation 5. infrared radiation, radio waves, visible light, ultraviolet radiation Explanation: ultraviolet radiation > visible light > infrared radiation > radio waves 002 (part 1 of 2) 10 points Light with a frequency of 7 . 21 × 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 416 . 089 nm. Explanation: ν = 7 . 21 × 10 14 Hz c = 3 × 10 8 m / s c = λ ν λ = c ν = 3 × 10 8 m / s 7 . 21 × 10 14 s - 1 = 4 . 16089 × 10 - 7 m · 10 9 nm 1 m = 416 . 089 nm 003 (part 2 of 2) 10 points When an electron beam strikes a block of copper, x-rays of frequency 9 . 3 × 10 18 Hz are emitted. What is the wavelength of these x- rays? Correct answer: 32 . 2581 pm. Explanation: ν = 9 . 3 × 10 18 Hz λ = c ν = 3 × 10 8 m / s 9 . 3 × 10 18 s - 1 = 3 . 22581 × 10 - 11 m · 10 12 pm 1 m = 32 . 2581 pm 004 (part 1 of 1) 10 points What kind of radiation causes molecules to vibrate? 1. infrared correct 2. visible 3. ultraviolet 4. microwave 5. x-rays Explanation: 005 (part 1 of 3) 10 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?
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