1.

What is speed of radio waves in free space?

A. 3 x 10<sup>6</sup> m/s
B. 3 x 10<sup>9</sup> m/s
C. 300 x 10<sup>6</sup> m/s
D. 300 x 10<sup>9</sup> m/s
Answer» D. 300 x 10<sup>9</sup> m/s


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