hw5solns

# hw5solns - Phys 273 Homework #5 solutions 5.9 (a) Wave...

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Phys 273 Homework #5 solutions

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5.9 (a) Wave speed c w = ( γ RT / M ) 1/2 = 343m/s for air at room temperature ( γ =1.4) so the wavenumber k = ω / c w = (2 π ·10 3 rads/sec)/(343 m/s) = 18.3 rads/m (b) intensity I = 0.5 ρω 2 ξ 0 2 c w = 0.5(1.3 kg/m 3 )(2 π ·10 3 rads/sec) 2 (10 -8 m) 2 (343 m/s) = 8.8·10 7 W/m 2 = 59 dB (c) Pressure wave Δ P(x,t) = γ P 0 k ξ ( x , t ), where P = 1 atm = 10 5 N/m 2 . So the amplitude of the pressure wave is γ P 0 k ξ 0 = (1.4)(10
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## This note was uploaded on 12/28/2011 for the course PHYSICS 273 taught by Professor Monroec during the Fall '11 term at Maryland.

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hw5solns - Phys 273 Homework #5 solutions 5.9 (a) Wave...

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