Practicing Success
Practicing Success
CUET Preparation Today
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 km from earth, how long does it take the light to make the round trip? |
5 min 2.5 min 2.5 s 500 s |
2.5 s |
$t = \frac{2s}{c}=\frac{2×38400×1000}{3×10^8}= 2.5\, s$ |
