Question

It is estimated that the radio signal takes 1.27 seconds to reach the earth from the surface of the moon. calculate the distance of the moon from the earth. speed of radio signal = 3×108 m s-1 (speed in light in air).

Answer 1

Speed = 3× 10^8 m/s
Time taken = 1.27

Speed × time = Distance
3× 10^8 × 1.27= distance = 3.81m