Question

a vibrating boday produce sound however no sound is heared whn a simple pendulum oscillation in air explain

Answer 1

Vibrations of body also depends on intensity it vibrates more is intensity if Vibrations then more will be sound heard
But in case of simple pendulum eventhough it vibrates intensity is less and by these Vibrations they cannot vibrate our ear drum
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Answer 2

Question :- A vibrating body produce sound however no sound is heard when a simple pendulum oscillates in air. Explain.

Answer :- For a sound to be heard, two cases are required :-

1) It must be loud enough to vibrate the ear drum

2) Even if it is loud, it should have a frequency which is audible for humans.

Human body can hear sound of frequency between the range of 20 Hz to 20,000 Hz or 20 kHz.

A simple pendulum when vibrates, creates a frequency of less than 20 Hz, which is inaudible for human beings. Hence, the sound is not heard to us.

More information :-

Sound having frequency less than 20 Hz is known as infrasonic sound and sound having frequency more than 20,000 kHz is known as ultrasonic sound or ultrasound. Both infrasonic and ultrasound are inaudible for humans.