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>


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