HW-2 - Rahman, Tarique Homework 2 Due: Sep 13 2007,...

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Rahman, Tarique – 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 – fnd all choices beFore answering. The due time is Central time. Here’s the frst oF two homeworks From Chapter 12 in your textbook. 001 (part 1 oF 1) 10 points What is the correct order oF increasing Fre- quency? 1. radio waves, inFrared radiation, ultravio- let radiation, visible light 2. radio waves, visible light, ultraviolet radi- ation, inFrared radiation 3. radio waves, inFrared radiation, visible light, ultraviolet radiation correct 4. ultraviolet radiation, visible light, in- Frared radiation, radio waves 5. inFrared radiation, radio waves, visible light, ultraviolet radiation Explanation: radio waves < inFrared radiation < visible light < ultraviolet radiation 002 (part 1 oF 2) 10 points Light with a Frequency oF 7 . 07 × 10 14 Hz lies in the violet region oF the visible spectrum. What is the wavelength oF this Frequency oF light? Correct answer: 424 . 328 nm. Explanation: ν = 7 . 07 × 10 14 Hz c = 3 × 10 8 m / s c = λ ν λ = c ν = 3 × 10 8 m / s 7 . 07 × 10 14 s - 1 = 4 . 24328 × 10 - 7 m · 10 9 nm 1 m = 424 . 328 nm 003 (part 2 oF 2) 10 points When an electron beam strikes a block oF copper, x-rays oF Frequency 2 . 72 × 10 19 Hz are emitted. What is the wavelength oF these x-rays? Correct answer: 11 . 0294 pm. Explanation: ν = 2 . 72 × 10 19 Hz λ = c ν = 3 × 10 8 m / s 2 . 72 × 10 19 s - 1 = 1 . 10294 × 10 - 11 m · 10 12 pm 1 m = 11 . 0294 pm 004 (part 1 oF 1) 10 points What kind oF radiation causes molecules to vibrate? 1. microwave 2. inFrared correct 3. visible 4. ultraviolet 5. x-rays Explanation: 005 (part 1 oF 3) 10 points Sodium vapor lamps, used For public lighting, emit yellow light oF wavelength 570 nm. How much energy is emitted by an excited sodium
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HW-2 - Rahman, Tarique Homework 2 Due: Sep 13 2007,...

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