Calculate the distance of a lightning during a thunderstorm

To know the distance that separates you from a lightning it is necessary to count the number of seconds which separate the sight of the lightning of the noise of the thunder. Count the seconds and enter this value below.

Complete the information below:

Time between lightning and thunder seconds

Distance from the lightning

The lightning is located kilometers from you

Info

The lightning flash arrives almost immediately in your eye at around 300,000 km / s. The slower sound arrives at a speed of 0.34 km / s in air at a temperature of 15 ° C. It is therefore necessary to count the time difference between lightning (light) and thunder (sound). The sound takes about 3 seconds to cover 1 km (2.94117647058824 seconds, the number used in this calculation). To estimate the Distance from the lightning, divide by 3 the number of seconds between lightning and thunder and you will get the approximate distance in kilometers.