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What is ultra sound and infra …

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What is ultra sound and infra sound

    • Posted by Sarbjeet Singh 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Akash Panchal 4 years, 7 months ago

    Ultrasonic sound which is more than 20kHz Infrasonic sound which is less than 20Hz

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