Question

Activity
8.7
At a time when it is cloudy, there may
be frequent thunder and lightning. The
sound of thunder takes some time to
reach you after you see the lightning.
Can you answer why this happens?
Measure this time interval using a
digital wrist watch or a stop watch.
Calculate the distance of the nearest
point of lightning. (Speed of sound in
air = 346 m s.)​

Answer 1

Answer:

The speed of sound in air is 346 metre per second whereas the speed of light in air is 299 792 kilometre per second. Hence, the speed of light is more then the speed of sound in air. And so for that in a cloudy day we can hear the sound of thunder after we see the crack of the lightening.