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A laser beamed towards moon from earth takes 2.56s to return.How much is the radius of lunar orbit? |
| Let ‘d’ be the distance between the surface of the earth to the surface of the moon. So, in 2.56 s the laser light travels 2d distance with speed 3 × 108m/s So, 2d = 2.56 × 3 × 108 => d = 384000000 m The radius of the moon’s orbit around the approximately = 384000000 m = 3.84 × 108m |
