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Question

If frequency of a wave is 5 Hz, then it is

A
Ultrasonics
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B
Microwaves
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C
Infrasonics
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D
Radio waves
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Solution

The correct option is C Infrasonics
Infrasound, sometimes referred to as low-frequency sound, is sound that is lower in frequency than 20 Hz or cycles per second, the "normal" limit of human hearing. So 5Hz is infrasonic.

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