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Asked: 2021-09-23T07:05:10+00:00 In:

Ultrasonic sound waves have frequency

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Poll Results

0%(a) less than 20 Hz
0%(b) 2000 Hz
0%(c) 20,000 Hz
100%(d) more than 20,000 Hz ( 9 voters )
Based On 9 Votes

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    1 Answer

    1. (d) more than 20,000 Hz

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