ZQuiz 1 solutions

# ZQuiz 1 solutions - δ = p 8 . 3 2 + (2 . 26 + 2 . 11) 2-p...

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1 Quiz 1 solutions are in order of the questions for version A. (1). Correct answer A The lowest frequency for a string clamped at both ends is f = c/ 2 L (2). Correct answer is B This problem involves two Doppler shifts. First, the wall hear a sound f wall = f 0 345 345 - 17 with f 0 = 345 and then the reﬂected sound is heard with frequency f = f wall 345+17 345 . Thus Δ f f - f 0 = 345 . 15 ± 362 328 - 1 ² 240 Hz (3). Correct answer is A When the string creates a vibration in the air, they must have the same frequency (4). Correct answer is D Waves do not transport matter. All the other statements are true (5). Correct answer is A The frequency of organ pipe modes (open-open condition) is f n = n v 2 L Hence the diﬀerence between any two successive modes is just 345 / 2 L = 30 Hz ; solving for L gives answer A (6). Correct answer is A The path diﬀerence δ must equal half a wavelength. We get the correct answer from

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Unformatted text preview: δ = p 8 . 3 2 + (2 . 26 + 2 . 11) 2-p 8 . 3 2 + (2 . 26-2 . 11) 2 (7). Correct answer is A The period of time between intensity maxima is just 1/(beat frequency). Here the beat frequency is just the diﬀerence of the two frequencies, i.e. 38/min = 38/60 Hz (8). Correct answer is D The tension is just F= μv 2 , where μ is the mass per unit length. This can determined from the density by multiplying with the cross sectional area; hence F = 2700 * π * (2 . 3 × 10-3 ) 2 * (30) 2 ’ 40 N 2 (9). Correct answer is D Energy transport is always proportional to the square of the amplitude (10). Correct answer is D The fact that sound intensity goes down from he source is a direct consequence of conservation of energy...
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## This note was uploaded on 12/13/2011 for the course PHYS 2C PHYS 2C taught by Professor Groisman during the Spring '11 term at UCSD.

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ZQuiz 1 solutions - δ = p 8 . 3 2 + (2 . 26 + 2 . 11) 2-p...

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