Question

sound is produced when body under to and fro motion however no sound is produced when a person waves his / her hand . why​

Answer 1

Explanation:vis versa sound sahi hai

Answer 2

Answer:

Answer: thats because the minimum to and fro motion needed is 20 vibration per second to hear sound. human hand cannot wave 20 times in a second, so sound is not produced.

Explanation:

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