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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
The sketches I to IV in following Figure show sound waves, all formed in the same time interval.
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 |
| I | II |
 |
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| III | IV |
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