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प्रश्न
What are infrasonic waves ? Name two animals which produce infrasonic waves.
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उत्तर
Infrasonic sound waves have frequencies lesser than 20 Hz. It is inaudible as its frequency lies below the human audible range of frequencies (20 Hz–20 kHz). These sounds are produced by objects vibrating very slowly. Whales and elephants can produce these sounds.
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