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प्रश्न
What do you understand by the term ultrasonic vibrations?
उत्तर
Those vibrations, whose frequency is more than 20000 hertz and are not perceived by human ear, are known as ultrasonic vibrations.
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संबंधित प्रश्न
Complete the following sentence:
Ultrasound is of frequency ___________.
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Infrasonic sound is of frequency ______________.
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10 Hz
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