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Unformatted text preview: huang (jwh2377) Homework 1 lang (58650) 1 This print-out should have 56 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points If the frequency of an electromagnetic wave is 1 10 6 Hz what is the wavelength? Correct answer: 3 10 11 nm. Explanation: = c f = 3 10 8 m / s 1 10 6 Hz = 300 m = 3 10 11 nm 002 (part 2 of 2) 10.0 points What type of electromagnetic wave is this? 1. gamma rays 2. ultraviolet 3. visible light 4. X-rays 5. radio wave correct 6. infrared 7. microwave Explanation: 003 10.0 points Of the following which type of electromag- netic wave has the longest wavelength? 1. X-rays. 2. microwaves. 3. FM radio waves. 4. red light. 5. violet light. 6. Gamma rays. 7. AM radio waves. correct Explanation: The ordering of the electromagnetic wave spectra starting with the longest wavelength is as following: AM radio waves, FM radio waves, microwaves, red light, violet light, X- rays, Gamma rays. 004 (part 1 of 2) 10.0 points Unpolarized white light is incident on a po- larizer and then falls on an analyzer whose TA (Transmission Axis) makes an angle of = 22 with the polarizer. What is the fraction of the original light transmitted through both the polarizer and analyzer? Correct answer: 0 . 429835. Explanation: We notice that only half of the light can pass through the polarizer and then fall on the analyzer. According to Malus Law, I = 1 2 I cos 2 I I = 1 2 cos 2 22 = . 429835 . 005 (part 2 of 2) 10.0 points If the analyzer is rotated until the transmit- ted intensity is 40 . 1 percent of the original light intensity, what is the new angle of the analyzer with respect to the polarizer? Correct answer: 26 . 4215 . Explanation: Let : I = 0 . 401 I . cos = radicalbigg 2 I I = radicalbig 2 (0 . 401) = 0 . 895545 = 26 . 4215 huang (jwh2377) Homework 1 lang (58650) 2 006 10.0 points When light passes from air into water, the frequency of the light remains the same. What happens to the speed and the wave- length of the light as it crosses the boundary in going from air into water? Speed Wavelength 1. Increases Remains the same 2. Decreases Increases 3. Remains the same Decrease 4. Remains the same Remains the same 5. Decreases Decreases correct Explanation: The speed of light in water is less than that in air. Since = v f , the wavelength in water is also less than that in air. So both speed and wavelength decrease when the light goes from air into water. 007 (part 1 of 3) 10.0 points Consider a light ray which enters from air to a liquid, where the index of refraction of the liquid is given by n = 1 . 4....
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