Question

Question 1. Suppose you have a simple pendulum. It sets the particles of air in vibration. Then why
can't you hear any sound from it?​

Answer 1

Answer:

no we can't hear any song because it is just only vibrating in air

Answer 2

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Answer:

yes we can't hear any sound

Sound is heard only if the body vibrates with a frequency of at least 20 Hz. Frequency of vibration of the pendulum is less than 20 Hz. Hence no sound is heard when the pendulum vibrates or oscillates in air.

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