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Intensity level at a distance 200 cm fro...

Intensity level at a distance 200 cm from a point source of sound is 80 dB. If there is it loss of acoustic power in air and intensity of threshold hearing is `10^-12` W`m^-2`, then the intensity level at a distance of 4000 cm from source is (log 20 = 1.3)

A

44 dB

B

54 dB

C

64 dB

D

Zero

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