Q. 64.2( 6 Votes )

Loudness of sound A. decibel (dB)

B. hertz (Hz)

C. metre (m)

D. metre/second (m/s)

Answer :

The loudness of the sound is expressed in decibel (dB). The loudness sound of normal breathing is 20 dB, soft whisper is 30 dB, normal conversation 60 dB. Above 80 dB the noise becomes physically painful.

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