A pendulum vibrates with a time period of 1 second. What kind of sound is produced by it?

Supersonic

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Audible

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Infrasonic

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Ultrasonic

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Solution

The correct option is C Infrasonic
The low frequency vibration of infrasonic wave is less than $20 H z$ . The pendulum vibrates at this low frequency with a time period of $1$ second.

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