Discussion Forum : Sound
Question -
For a sound wave travelling towards +x direction, sinusoidal longitudinal displacement ξ at a certain time is given as a function of x(Figure). If bulk modulus of air is B=5×105N/m2, the variation of pressure excess will be
Options:
A .
B .
C .
D .
Answer: Option D
:
D
ξ=Asin(kx−ωt)Pex=−Bdξdx=−BAk cos(kx−ωt)Amplitude of Pex isBAk=(5×105)(10−4)(2π0.2)=5π×102Pa
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:
D
ξ=Asin(kx−ωt)Pex=−Bdξdx=−BAk cos(kx−ωt)Amplitude of Pex isBAk=(5×105)(10−4)(2π0.2)=5π×102Pa
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