MCQOPTIONS
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| 1. |
The velocity of wave in the air medium is$ |
| A. | 1 x 10<sup>8</sup> |
| B. | 1.5 x 10<sup>8</sup> |
| C. | 3 x 10<sup>8</sup> |
| D. | 1 x 10<sup>9</sup> |
| Answer» D. 1 x 10<sup>9</sup> | |