Q.

Sound of frequency below 20 Hz is called
(a)Infrasonic Right sign
(b)Audio sounds
(c)Supersonics
(d)Ultrasonic
Details:Result for Sound of frequency below 20 Hz is called Infrasound, sometimes referred to as low-frequency sound, describes sound waves with a frequency below the lower limit of audibility (generally 20 Hz). ... The study of such sound waves is sometimes referred to as infrasonics, covering sounds beneath 20 Hz down to 0.1 Hz.

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