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Asked by minipkda 25th May 2018, 10:05 PM
Answered by Expert
Answer:
Intensity of wave I = (1/2)(ρv)(Aω)...................(1)
 
Pressure amplitude P0= ρvAω ............................(2)
 
(reference for the above formulas : http://www.insula.com.au/physics/1279/L14.html )
 
ρ is density of air, v is speed of sound, A is amplitude, ω is angular frequency (2πf)
 
from (1) we get amplitude 
 
begin mathsize 12px style A space equals space square root of fraction numerator 2 I over denominator rho v omega squared end fraction end root space equals space square root of fraction numerator 2 cross times 10 to the power of negative 10 end exponent over denominator 1.3 cross times 330 cross times 4 pi squared cross times 10 to the power of 6 end fraction end root space equals space 1.087 cross times 10 to the power of negative 10 end exponent space m end style
P0 = 1.3×330×1.087×10-10 ×2π×1000 = 2.93×10-4 N/m2
 
 
Answered by Expert 28th May 2018, 12:27 PM
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