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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 | |