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प्रश्न
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
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उत्तर
| Ultrasonics | Frequency more than 20000 Hz |
| Speed of sound in air | 330ms-1 |
| Infrasonics | Frequency below 20Hz |
| Sound propagation | Needs material medium |
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