Infrasonic vibrations have frequency:

less than 10 Hz

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less than 20 Hz

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between 20 and 20,000 Hz

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more than 20,000 Hz

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Solution

The correct option is B
less than 20 Hz

The human ears can hear a sound wave in the range of frequency 20 Hz - 20,000 Hz. The sound that has a frequency below this range is called infrasonic sound and a sound of frequency greater than the hearable range is called ultrasonic.

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Similar questions

Vibrations with frequencies above 20,000 Hz are called infrasonic vibrations.

Sounds having frequencies lower than 20 Hz are called:

Infrasonic frequency range is

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