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Vibrations of...

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Vibrations of frequency less than 20 Hz are called ..........

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Solution

The audible frequency range for human ear is from 20Hz to 20000Hz , above 20000Hz , it is called ultrasonic and below 20Hz , it is infrasonic , as the given frequency is less than 20Hz , so it is infrasonic .

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Group 'A' Group 'B'

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