Question

If a thunder is heard by a man 4 seconds after the lighting is seen how far is the the lighting from the man

Answer 1

The light will take negligible time to reach the observer's eye its speed being 3*10^8 m/s. So the time taken by thunder sound to reach the man was 4 s.

Let the speed of sound in air be 340 m/s.

Distance=speed*time

=330*4 m

=1320 m

Hence, the man was 1320m away from the lightning.

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