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F05Exam2

# F05Exam2 - PHYSICS 222 FALL 2005 EXAM#2 NOVEMBER 3 2005...

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In this exam, assume: 1. the bulk modulus of air is 140 kPa 2. the traveling sound wave speed in air is 340 m/s 3. the index of refraction of air or vacuum is 1.00 4. the index of refraction of glass is 1.50 5. the index of refraction of water is 1.33 6. the speed of light in vacuum or air is 3.00 × 10 8 m/s Problems 31-45 are worth 2 points each. 31. Standing sound waves are produced in a pipe that is 0.90 m long. The pipe is closed at the left end and open at the right end. For the third harmonic mode, the air displacement nodes are ____ m and ____ m from the left end of the pipe. A. 0.00 and 0.45 B. 0.00 and 0.60 C. 0.00 and 0.90 D. 0.30 and 0.90 E. 0.30 and 0.60 32. Two side-by-side speakers isotropically emit sound waves with the same amplitude but slightly different frequencies f 1 and f 2 , respectively. The beat frequency you hear is ____ .
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F05Exam2 - PHYSICS 222 FALL 2005 EXAM#2 NOVEMBER 3 2005...

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