Chapt_18

# Chapt_18 - University Physics (Prof. David Flory) Chapt_18...

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University Physics (Prof. David Flory) Chapt_18 Monday, November 26, 2007 Page 1 Name: __________________________ Date: _____________ 1. An organ pipe with both ends open is 0.85 m long. Assuming that the speed of sound is 340 m/s, the frequency of the third harmonic of this pipe is: A) 200 Hz B) 300 Hz C) 400 Hz D) 600 Hz E) none of these 2. “Beats” in sound refer to: A) interference of two waves of the same frequency B) combination of two waves of slightly different frequency C) reversal of phase of reflected wave relative to incident wave D) two media having slightly different sound velocities E) effect of relative motion of source and observer 3. The lowest tone produced by a certain organ comes from a 3.0-m pipe with both ends open. If the speed of sound is 340 m/s, the frequency of this tone is approximately: A) 7 Hz B) 14 Hz C) 28 Hz D) 57 Hz E) 70 Hz 4. If the speed of sound is 340 m/s, the length of the shortest closed pipe that resonates at 218 Hz is: A) 23 cm B) 17 cm C) 39 cm D) 78 cm E) 1.56 cm Write the letter for the correct answer on the answer sheet. Write clearly.

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University Physics (Prof. David Flory) Chapt_18 Monday, November 26, 2007 Page 2 5. Two identical strings, A and B, have nearly the same tension. When they both vibrate in their fundamental resonant modes, there is a beat frequency of 3 Hz. When string B is tightened slightly, to increase the tension, the beat frequency becomes 6 Hz. This means: A) that before tightening A had a higher frequency than B, but after tightening, B has a higher frequency than A B) that before tightening B had a higher frequency than A, but after tightening, A has a higher frequency than B C) that before and after tightening A has a higher frequency than B D) that before and after tightening B has a higher frequency than A E) none of the above 6. A source emits sound with a frequency of 1000 Hz. Both it and an observer are moving toward each other, each with a speed of 100 m/s. If the speed of sound is 340 m/s, the
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## This note was uploaded on 11/20/2011 for the course PHYS University taught by Professor Davidflory during the Spring '11 term at WPUNJ.

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Chapt_18 - University Physics (Prof. David Flory) Chapt_18...

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