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Unformatted text preview: This print-out should have 14 questions. Multiple-choice 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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oldhw37 - This print-out should have 14 questions....

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