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The loudness of noise falling on the window (area A =2 m^2) of a hall is 40 dB. What is the amount of sound energy entering the window every second ?

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The loudness of noise falling on the window (area A =2 m2) of a hall is 40 dB. What is the amount of sound energy entering the window every second ?

(a) 2 x 10-4 J

(b) 2 x 10-8 J

(c) 10-4 J

(d) 10-8 J

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The correct option is (b) 2 x 10-8 J.

Explanation:

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