Answers

2015-06-11T21:03:58+05:30
It is due to the range of hearing.The audible range of sound is from 20Hz to 20,000Hz. If the frequency is less than 20Hz or if it is more than 20,000Hz then the sound cannot be heard.Therefore, sound produced by every vibrating body cannot be heard by us.

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2015-06-11T21:05:41+05:30
Because its less than 20 Hz or greater than 20000Hz

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