Give reasons for the following:

(a) The reverberation time of a hall used for speeches should be very short.

(b) A vibrating body produces sound. However, no sound is heard when a simple pendulum oscillates in air.

(c) Sounds of same loudness and pitch but produced by different musical instruments like a violin and flute are distinguishable.

Ans. (a) The reverberation time of a speech should the small so that we are able to listen clearly the speech. If the reverberation time is large, the effect of speech heard will be lost for a longer time and new words will not be understood clearly.

(b) To be heard a sound must have a minimum frequency of 20 Hz and a maximum frequency 20 kHz. The frequency of simple pendulum is less than 20 Hz and is hence not audible.

(c) It is the quality of sound which enables us to distinguish between two sounds of same loudness and pitch.

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