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Unformatted text preview: This printout should have 14 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points Radio waves travel at the speed of light: 3 10 5 km / s. What is the wavelength of radio waves re ceived at 92 . 3 MHz on your FM radio dial? Correct answer: 3 . 25027 m. Explanation: Let : v = 3 10 5 km / s = 300 million m / s and f = 92 . 3 MHz = 92 . 3 million Hz . = v f = 300 million m / s 92 . 3 million Hz = 3 . 25027 m . 002 10.0 points Two harmonic waves are described by y 1 = A sin( k x t 1 ) and y 2 = A sin( k x t 2 ) , where k = 6 m 1 , A = 7 m , = 819 rad / s , 1 = 0 rad , and 2 = 5 rad . What is the frequency of the resultant wave y = y 1 + y 2 ? Correct answer: 130 . 348 Hz. Explanation: Since sin 1 + sin 2 = sin 1 + 2 2 cos 1 2 2 , the resultant wave is y = y 1 + y 2 = A cos parenleftbigg 2 1 2 parenrightbigg sin parenleftbigg k x t 1 + 2 2 parenrightbigg and the frequency is f = 2 = 819 rad / s 2 = 130 . 348 Hz . 003 (part 1 of 2) 10.0 points A harmonic wave in a wire has amplitude 7 . 99 mm, wavelength 2 . 3 m, and frequency 285 Hz. What is the propagation speed of the wave?...
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 Spring '08
 Turner
 Work, Light

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