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Is it true that sound is produced when a person waves his/her hand as it undergoes to-and-fro movement?

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True

False

answer is B.

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Detailed Solution

The above statement is false.
The minimum frequency required to hear a sound by humans is

20 Hz

. This means that

20

vibrations per second should be produced. but a human cannot produce

20

vibrations per second and hence, no sound is produced when a person waves the hand.
The correct statement is that no sound is produced when a person waves his/her hand as it undergoes to-and-fro movement.

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