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Q.

The frequency of infrasonic sound is:

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a

above 20kHz 

b

below 20Hz

c

below 20kHz

d

above 20Hz 

answer is A.

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Detailed Solution

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  • Infra-sound is a low-frequency sound and has a frequency below 20 Hz (hertz), the lower limit of human hearing. 
  • Whales, elephants, hippopotamuses, etc infrasound to communicate over distances.
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Therefore, 'Below 20 Hz' is the correct response.
 

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