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  • A lasser beam is sent to the moon and reflected back to earth by ay mirror placed on the moon by an astronaut. If the moon is <img alt="384000 \mathrm{~km}" src="/latex-image/?384000%20%5Cmath

A lasser beam is sent to the moon and reflected back to earth by ay mirror placed on the moon by an astronaut. If the moon is 384000 \mathrm{~km} from earth, how long does it take the light to make the round trip?

Option: 1

5 min


Option: 2

2.5 min


Option: 3

2.5 s


Option: 4

500 s


Answers (1)

best_answer

\mathrm{t=\frac{2 s}{c}=\frac{2 \times 38400 \times 1000}{3 \times 10^8}=2.5 \mathrm{~s}}

Posted by

Shailly goel

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