Answer:
Light is significantly faster than sound so we will not be able to recognize the difference between the light of the lightning bolt falling and the light actually reaching our eyes. So, we can ignore the time for the light flash to reach you.
Step-by-step explanation:
The speed of sound in air is 331 m/s. This means that in 1 second sound covers a distance of 331 m. Lightning causes thunder. In order to know the distance of the lightning bolt we must measure the time thunder takes to reach our ears. After looking at the lightning bolt we must note down the time before we can hear the thunder. Then we multiply the speed of sound in air with the time and we will obtain the distance.
For example we hear thunder after 10 seconds of the bolt falling. Then we multiply the time with the speed and we get the distance i.e., 331×10=3310 m = 3.31 km.
Light is significantly faster than sound so we will not be able to recognize the difference between the light of the lightning bolt falling and the light actually reaching our eyes. So, we can ignore the time for the light flash to reach you.