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Unformatted text preview: shah (rps587) Homework 2 mcdevitt (52365) 1 This print-out should have 25 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 en- ergy? 1. microwaves, visible light, ultraviolet light, x-rays, -rays 2. visible light, microwaves, x-rays, -rays, ltraviolet light 3. -rays, x-rays, ultraviolet light, visible light, microwaves correct 4. visible light, ultraviolet light, microwaves, x-rays, -rays 5. microwaves, visible light, x-rays, -rays, ltraviolet light Explanation: -rays > x-rays > ultraviolet light > visible light > microwaves 002 10.0 points In the visible spectrum blue light is associated with 1. long wavelengths. 2. middle wavelengths. 3. short wavelengths. correct 4. low energy. Explanation: In the visible spectrum, blue light has high energy and short wavelengths. 003 10.0 points Calculate the wavelength of radiation with a frequency of 5 . 1 10 14 per second. Correct answer: 5 . 88235 10- 7 meters. Explanation: 004 10.0 points Which of the following statements best sum- marizes the Planck theory of light? 1. Light should not be thought of as parti- cle in nature; rather it always behaves as a wave. 2. Light contains bundles of energy; all col- ors of light have bundles with the same en- ergy. 3. Light is made up of bundles of matter resembling an elephants trunk. 4. Light contains bundles of energy; the longer the wavelength of light, the higher the energy of the bundles. 5. Light contains bundles of energy; the shorter the wavelength of light, the higher the energy of the bundles. correct Explanation: 005 10.0 points Derive an equation expressing E in terms of h , c , and , given the relationships E = h and c = . 1. E = c h 2. E = h c 3. None of these 4. E = h c 5. E = c h 6. E = h 7. E = h c correct 8. E = h c 9. E = h c shah (rps587) Homework 2 mcdevitt (52365) 2 10. E = 1 h c Explanation: c = = c Thus E = h = h c 006 10.0 points What is the frequency of a radio wave with an energy of 3 . 411 10- 24 J/photon? Correct answer: 5 . 1479 10 9 Hz. Explanation: E photon = 3 . 411 10- 24 J = ? E photon = h = E photon h = 3 . 411 10- 24 J 6 . 626 10- 34 J s = 5 . 1479 10 9 Hz 007 10.0 points Light behaves like 1. a wave. 2. a particle. 3. both a particle and a wave. correct 4. neither a particle nor a wave....
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This note was uploaded on 04/16/2009 for the course CH 52365 taught by Professor Mcdevitt during the Spring '09 term at University of Texas at Austin.
- Spring '09