Chemistry HW 2 - Kim, Eugene Homework 2 Due: Sep 13 2007,...

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Unformatted text preview: Kim, Eugene Homework 2 Due: Sep 13 2007, midnight Inst: McCord 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. This homework is the first of two home- works 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. ultraviolet radiation, visible light, in- frared radiation, radio waves 4. radio waves, infrared radiation, visible light, ultraviolet radiation correct 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 . 39 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 405 . 954 nm. Explanation: = 7 . 39 10 14 Hz c = 3 10 8 m / s c = = c = 3 10 8 m / s 7 . 39 10 14 s- 1 = 4 . 05954 10- 7 m 10 9 nm 1 m = 405 . 954 nm 003 (part 2 of 2) 10 points When an electron beam strikes a block of copper, x-rays of frequency 1 . 17 10 19 Hz are emitted. What is the wavelength of these x-rays? Correct answer: 25 . 641 pm. Explanation: = 1 . 17 10 19 Hz = c = 3 10 8 m / s 1 . 17 10 19 s- 1 = 2 . 5641 10- 11 m 10 12 pm 1 m = 25 . 641 pm 004 (part 1 of 1) 10 points What kind of radiation causes molecules to vibrate? 1. microwave 2. infrared correct 3. visible 4. x-rays 5. ultraviolet Explanation: 005 (part 1 of 3) 10 points Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 590 nm. How much energy is emitted by an excited sodium...
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Chemistry HW 2 - Kim, Eugene Homework 2 Due: Sep 13 2007,...

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