The speed of light in space is:
A) infinite, traveling through space instantaneously.
B) variable, depending on the speed of its source, but very large (on average, 3 × 10⁸ meters per second).
C) 3 × 10¹⁰ meters per second, independent of the speed of the source.
D) 3 × 10⁸ meters per second, independent of the speed of the source.

Question

Quizplus · Accepted Answer

The speed of light in a vacuum is a constant value of 3 × 10⁸ meters per second, as determined by numerous experiments. This speed is independent of the motion of the source or observer. Therefore, option D is the correct choice.

The Speed of Light in Space Is