Q.

The velocity of light in vacuum is :

A. 3 * 108 ms-1
B. 2 * 108 ms-1
C. 3 * 107 ms-1
D. 3 * 106 ms-1
Answer» A. 3 * 108 ms-1
Explanation: The speed of light in a vacuum is 186,282 miles per second that corresponds to about 3 * 108 ms-1.
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