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  1. Ultrasonics are sound waves of frequency
    1. greater than 20,000 Hz
    2. less than 10,000 Hz
    3. equal to 1000 Hz
    4. None of these
Correct Option: A

Ultrasonics are sound waves of frequency greater than 20,000 Hz. The frequency range 20Hz to 20,000 Hz is human audible range of frequency.


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