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  • A window whose area is 2 m2 open on a street where the street noise results in an intensity level of 60 dB at the window. If an acoustic absorber is fitted at the window, the energy from

A window whose area is 2 m2 open on a street where the street noise results in an intensity level of 60 dB at the window. If an acoustic absorber is fitted at the window, the energy from the street will it collect in 10 hours will be

Option: 1

36 \;mJ
 


Option: 2

48 \;mJ


Option: 3

72 \;mJ

 


Option: 4

24 \;mJ


Answers (1)

best_answer

Answer (3)

L=10 \log \frac{I}{I_{0}}

10 \log \frac{I}{I_{0}}=60

\log \frac{I}{I_{0}}=6

\log \frac{I}{I_{0}}=10^{6}

I=10^{-6}W/m^{2}

Power =IA

              =2\times 10^{-6}

 E=2\times10^{-6}\times10\times60\times60

      =72\; mJ

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Riya

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