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प्रश्न
What are infrasonic and ultrasonic sounds?
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उत्तर
Sound having frequency less than 20Hz is called infrasonic sound. Sound having frequency greater than 20KHz is called ultrasonic sound.
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संबंधित प्रश्न
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1000 Hz
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An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.
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