The distance between Earth and the Moon is 3.84 10⁸ m.A pulse of laser light aimed at the Moon that bounces back to Earth undergoes a round-trip time of about A)zero seconds. B)less than 1 second. C)two and a half seconds. D)three seconds.

Question

Quizplus · Accepted Answer

The round-trip time of the pulse of laser light aimed at the Moon and bouncing back to Earth can be calculated by dividing the distance between Earth and the Moon by the speed of light. The speed of light is 299,792,458 m/s. Therefore, the round-trip time would be:

(2 x 3.84 x 10^8 m) / 299,792,458 m/s = 2.563 seconds or approximately 2 and a half seconds.

Therefore, the best choice is C, two and a half seconds.

The Distance Between Earth and the Moon Is 3