If you were traveling at the speed of light, next to a beam of light, the beam would appear to
A)be at relative rest, traveling beside you at an equal speed.
B)still travel away from you, but at a speed less than c.
C)travel away from you at c.
From this we see that the speed of light in free space will be found to
D)have the same value for all observers.
E)be relative to the motion of the observer.

Question

Quizplus · Accepted Answer

According to Einstein's theory of relativity, the speed of light in a vacuum is constant and will always be measured as c (approximately 299,792,458 meters per second) by all observers, regardless of their relative motion. Therefore, even if you were traveling at the speed of light, you would still observe the beam of light traveling away from you at speed c. This also implies that the speed of light is the same for all observers, regardless of their motion.

If You Were Traveling at the Speed of Light, Next