Infrasonic sounds have frequencies

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above 25 kHz

between 20 kHz and 25 kHz

below 20 Hz

between 20 Hz and 20 kHz

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UPSC Geoscientist – 2023

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The correct answer is C) below 20 Hz.

Sound waves are classified based on their frequency ranges relative to human hearing. The typical range of hearing for a healthy young human is from approximately 20 Hertz (Hz) to 20,000 Hertz (20 kHz). Sounds with frequencies below this audible range are called infrasonic sounds.

Sounds with frequencies above the audible range (above 20 kHz) are called ultrasonic sounds. Animals like elephants, whales, and dolphins can produce and perceive infrasonic sounds, often used for long-distance communication. Sources of infrasound include earthquakes, volcanic eruptions, weather phenomena like storms, and large machinery.

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