Question

the minimum number of times per second a body should vibrate to make an audible sound for human is ( )
a)10
b)0
c)30
d)5​

Answer 1

Answer:

20Hz

Explanation:

The minimum frequency required to hear a sound by humans is 20 Hz. Which means 20 vibrations per second. By waving his hand, a person can not produce 20 vibrations in a single second. Hence, no sound is produced when a person waves his/her hand.

Answer 2

20Hz

Explanation:

A vibrating body should oscillator for minimum 20 times per second to make an audible sound for humans. The human can hear the sounds which have frequency in the frequency range of 20Hz to 20kHz.