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Unformatted text preview: hernandez (ejh742) oldhomework 32 Turner (58120) 1 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 . 5 MHz on your FM radio dial? Correct answer: 3 . 24324 m. Explanation: Let : v = 3 10 5 km / s = 300 million m / s and f = 92 . 5 MHz = 92 . 5 million Hz . = v f = 300 million m / s 92 . 5 million Hz = 3 . 24324 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 = 9 m 1 , A = 9 . 9999 m , = 319 rad / s , 1 = 0 rad , and 2 = 2 rad . What is the frequency of the resultant wave y = y 1 + y 2 ? Correct answer: 50 . 7704 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 = 319 rad / s 2 = 50 . 7704 Hz . 003 (part 1 of 2) 10.0 points A harmonic wave in a wire has amplitude 4 . 74 mm, wavelength 2 . 13 m, and frequency 300 Hz....
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 Spring '08
 Turner
 Physics, Work

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