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प्रश्न
Complete the following sentence:
Infrasonic sound is of frequency ______________.
रिक्त स्थान भरें
उत्तर
Infrasonic sound is of frequency below 20 Hz.
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संबंधित प्रश्न
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 |
 |
| I | II |
 |
 |
| III | IV |
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