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What is audible and inaudible sound

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What is audible and inaudible sound

    • Posted by Ayush Rana 7 years, 5 months ago

    CBSE > Class 08 > Science
    • 1 answers

    Kritika Trehan 7 years, 5 months ago

    1. Inaudible sound: Human ear cannot detect sound frequencies less than 20 vibrations per second i.e. 20 Hz. So any sound below this frequency will be inaudible sound for humans. In the high-frequency range, the human ear cannot detect frequencies above 20000 vibrations per second (20 KHz).  So the frequencies below 20 Hz and above 20 KHz comes under the category of inaudible frequencies. The low-frequency sound which human ear cannot detect are also known as infrasonic sound. Whereas the higher range inaudible frequency are also known as ultrasonic sound.
    2. Audible sound: Human ear can easily detect frequencies between 20 Hz and 20 KHz. Hence sound waves with frequency ranging from 20 Hz to 20 KHz is known are audible sound. The human ear is sensitive to every minute pressure difference in the air if they are in the audible frequency range. It can detect pressure difference of less than one billionth of atmospheric pressure

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