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प्रश्न
What do you understand by the term infrasonic vibrations?
एका वाक्यात उत्तर
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उत्तर
Infrasonic vibrations: Those vibrations whose frequency is less than 20 hertz are known as infrasonic vibrations
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संबंधित प्रश्न
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 |
 |
| I | II |
 |
 |
| III | IV |
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