Question

2. The frequency of infrasonic waves is :
(b) between 20 and 10,000 Hz
(c) between 20 and 20,000 Hz
(a) less than 20 Hz
(d) above 20,000 Hz.
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Answer 1

Answer:

Less than 20Hz

Explanation:

Infrasonic waves are the Sound waves below the frequency of audible sound i-e less than 20Hz

Answer 2

The answer is a) less than 20 HZ