HW2S - Gauthier, Joseph Homework 2 Due: Sep 13 2007,...

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Unformatted text preview: Gauthier, Joseph 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. Heres the first 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, visible light, ultraviolet radi- ation, infrared radiation 2. radio waves, infrared radiation, visible light, ultraviolet radiation correct 3. radio waves, infrared radiation, ultravio- let radiation, visible light 4. infrared radiation, radio waves, visible light, ultraviolet 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 points Light with a frequency of 7 . 24 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 414 . 365 nm. Explanation: = 7 . 24 10 14 Hz c = 3 10 8 m / s c = = c = 3 10 8 m / s 7 . 24 10 14 s- 1 = 4 . 14365 10- 7 m 10 9 nm 1 m = 414 . 365 nm 003 (part 2 of 2) 10 points When an electron beam strikes a block of copper, x-rays of frequency 1 . 27 10 19 Hz are emitted. What is the wavelength of these x-rays? Correct answer: 23 . 622 pm. Explanation: = 1 . 27 10 19 Hz = c = 3 10 8 m / s 1 . 27 10 19 s- 1 = 2 . 3622 10- 11 m 10 12 pm 1 m = 23 . 622 pm 004 (part 1 of 1) 10 points What kind of radiation causes molecules to vibrate? 1. infrared correct 2. x-rays 3. ultraviolet 4. microwave 5. visible 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...
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This note was uploaded on 03/19/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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HW2S - Gauthier, Joseph Homework 2 Due: Sep 13 2007,...

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