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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 . λ = 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 ω t φ 1 ) and y 2 = A sin( k x ω t φ 2 ) , where k = 9 m 1 , A = 9 . 9999 m , ω = 319 rad / s , φ 1 = 0 rad , and φ 2 = 2 rad . What is the frequency of the resultant wave y = y 1 + y 2 ? Correct answer: 50 . 7704 Hz. Explanation: Since sin θ 1 + sin θ 2 = sin θ 1 + θ 2 2 cos θ 1 θ 2 2 , the resultant wave is y = y 1 + y 2 = A cos parenleftbigg φ 2 φ 1 2 parenrightbigg × sin parenleftbigg k x ω t φ 1 + φ 2 2 parenrightbigg and the frequency is f = ω 2 π = 319 rad / s 2 π = 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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This note was uploaded on 06/14/2011 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas.
 Spring '08
 Turner
 Physics, Work

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