Laser is a type of electronic device that is built based on the quantum principle which creates a beam of single color photons with the same frequency and phase. This tutorial explains how to calculate the laser pulse time duration.
The average distance between the moon's surface and the earth's surface is 384403 kilometers (km). Light travels at a speed roughly 3 x 108 meters/second (m/s). How long does it take for a laser pulse to reach the Moon and to bounce back to the Earth?
Substitute the values in the formula,
|Time||= (2 x d) / s|
|= (2 x 384403 x 103) / 300000000|
|= 768806 x 103 / 300000000|
|= 768806000 / 300000000|
|= 2.56 seconds|