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# Learn How to Calculate Laser Pulse Time Duration - Definition, Example, Formula

## How to Calculate Laser Pulse Time Duration - Example, Formula

#### Definition:

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.

#### Formula:

Time = (2 x d) / s
##### Where,
d = Distance from earth to moon (approximately 384403 km) s = Speed of laser pulse

#### Example :

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?

#### Given,

Distance (d) = 384403km
Speed (s) = 3 x 108 m/s = 300000000

Time

#### Solution:

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