Problem Set - Chavana Megan – Homework 2 – Due midnight...

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Unformatted text preview: Chavana, Megan – Homework 2 – Due: Sep 11 2007, midnight – Inst: Sara Sutcliffe 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. 001 (part 1 of 1) 10 points What is the correct order of decreasing fre- quency? 1. visible light, ultraviolet radiation, in- frared radiation, radio waves 2. infrared radiation, radio waves, visible light, ultraviolet radiation 3. ultraviolet radiatioin, visible light, in- frared radiation, radio waves correct 4. radio waves, infrared radiation, visible light, ultraviolet radiation 5. radio waves, visible light, ultraviolet radi- ation, infrared radiation Explanation: ultraviolet radiation > visible light > infrared radiation > radio waves 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 1 . 42 × 10 19 Hz are emitted. What is the wavelength of these x-rays? Correct answer: 21 . 1268 pm. Explanation: ν = 1 . 42 × 10 19 Hz λ = c ν = 3 × 10 8 m / s 1 . 42 × 10 19 s- 1 = 2 . 11268 × 10- 11 m · 10 12 pm 1 m = 21 . 1268 pm 004 (part 1 of 1) 10 points What kind of radiation causes molecules to vibrate? 1. ultraviolet 2. x-rays 3. infrared correct 4. microwave 5. visible 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 atom when it generates a photon?...
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This note was uploaded on 03/19/2008 for the course M 408k taught by Professor Schultz during the Spring '08 term at University of Texas.

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Problem Set - Chavana Megan – Homework 2 – Due midnight...

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