Time period of a vibrating body is 0.0001 second. Sound produced by it is:

ultrasonic sound

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infrasonic sound

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sonic sound

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not audible to us

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Solution

The correct option is C sonic sound

Normal human hearing range is from 20Hz to 20kHz and sounds within this frequency range are called sonic sounds. A sound with frequency less than 20 Hz is called infrasonic sound and a sound with a frequency above 20kHz is called ultrasonic sound.
We know frequency = $\frac{1}{t i m e p e r i o d}$ = $\frac{1}{0.0001}$ = 10,000 Hz. This sound is a sonic sound.

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