# HW23.sol - homework 23 – RAHMAN, TARIQUE – Due: Apr 29...

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Unformatted text preview: homework 23 – RAHMAN, TARIQUE – Due: Apr 29 2008, 4:00 am 1 Question 1, chap 17, sect 2. part 1 of 1 10 points Why can the tremor of the ground from a distant explosion be felt before the sound of the explosion can be heard? 1. The sound travels faster in the solid ground than in air. correct 2. The frequency of the sound is higher in the solid ground than in air. 3. The wavelength of the sound is smaller in the ground than in air. 4. The amplitude of the sound is bigger in the solid ground than in air. Explanation: The tremor in the ground can be felt before a distant explosion is heard because sound travels faster in the solid ground than in air. Question 2, chap 17, sect 2. part 1 of 2 10 points The highest frequencies humans can hear is about 20000 Hz. What is the wave length of sound in air at this frequency? (The speed of sound is 340 m / s.) Correct answer: 0 . 017 m (tolerance ± 1 %). Explanation: v = fλ λ = v f = 340 m / s 20000 Hz = . 017 m . Question 3, chap 17, sect 2. part 2 of 2 10 points What is the wavelength for the lowest sounds we can hear, about 20 Hz? Correct answer: 17 m (tolerance ± 1 %). Explanation: λ = v f = 340 m / s 20 Hz = 17 m . Question 4, chap 17, sect 2. part 1 of 1 10 points At a maximum level of loudness, the power output of a 75-piece orchestra radiated as sound is 66.7 W. What is the intensity of these sound waves to a listener who is sitting 32.1 m from the orchestra? Correct answer: 0 . 00515117 W / m 2 (tolerance ± 1 %). Explanation: Let : P = 66 . 7 W and r = 32 . 1 m . intensity = P 4 π r 2 = 66 . 7 W 4 π (32 . 1 m) 2 = . 00515117 W / m 2 ....
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## This note was uploaded on 02/03/2010 for the course PHY 303K taught by Professor Turner during the Fall '08 term at University of Texas.

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HW23.sol - homework 23 – RAHMAN, TARIQUE – Due: Apr 29...

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