HW01-solutions-QUY - arriaga (yga77) HW01 quy (50970) 1...

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Unformatted text preview: arriaga (yga77) HW01 quy (50970) 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points What is the correct order of decreasing fre- quency? 1. visible light, ultraviolet radiation, in- frared radiation, radio waves 2. radio waves, infrared radiation, visible light, ultraviolet radiation 3. infrared radiation, radio waves, visible light, ultraviolet radiation 4. ultraviolet radiation, visible light, in- frared radiation, radio waves correct 5. radio waves, visible light, ultraviolet radi- ation, infrared radiation Explanation: ultraviolet radiation > visible light > infrared radiation > radio waves 002 10.0 points Which of the following provided evidence that the electrons in atoms are arranged in distinct energy levels? 1. the deflection of ions in a mass spectrom- eter 2. the observation of line spectra from gas discharge tubes correct 3. the results of the Millikan oil-drop exper- iment 4. the existence of elements with noninteger values for atomic weights 5. the scattering of particles by a metal foil Explanation: The fact that gases emitted only specific wavelengths of energy suggested that electron energy states are quantized. 003 10.0 points Consider a flea of mass 4 . 5 10 4 g moving at 1 . 0 m / s midway through its jump. What is its de Broglie wavelength? 1. 1 . 4725 10 30 m 2. 2 . 9818 10 37 m 3. 1 . 47244 10 27 m correct 4. 2 . 9818 10 40 m Explanation: m = 0 . 00045 g . 001 kg 1 g = 4 . 5 10 7 kg = h p = h m v = 6 . 626 10 34 kg m 2 s (4 . 5 10 7 kg)(1 m / s) = 1 . 47244 10 27 m 004 10.0 points All of these are forms of electromagnetic radi- ation except 1. plane-polarized light. 2. gamma rays. 3. enantiomers. correct 4. microwaves. Explanation: 005 10.0 points Visible light, microwaves, and x-rays travel through empty space at 3.00 10 8 m s 1 . 1. True correct arriaga (yga77) HW01 quy (50970) 2 2. False Explanation: All forms of electromagnetic radiation move at the same speed through empty space, at speed c = 3 10 8 m/s....
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This note was uploaded on 01/30/2012 for the course CHEM 301 taught by Professor Wandelt during the Spring '08 term at University of Texas at Austin.

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HW01-solutions-QUY - arriaga (yga77) HW01 quy (50970) 1...

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