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 ms'.)
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Answer:
The velocity of light is much greater than the velocity of sound. So we see lightning faster than the time before the thunder is heard. Since the velocity of light is much greater than the velocity of sound, that's why we see the lightning first.
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