Infrasounds have frequency ___.

below 20 Hz

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between 20 - 2000 Hz

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between 2000 - 20 kHz

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above 20 kHz

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Solution

The correct option is A below 20 Hz
Infrasound refers to sound having frequency lesser than the lower audible limit of human hearing. It has frequency below 20 Hz. Animals like giraffe, elephant and pigeons are capable of hearing infrasound.

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