The speed of sound in air is 60 m/s. How far from the centre of a storm is an observer who hears a thunder clap 4s after the flash of the lightning?
Speed of sound = 60 m/s
Time delay = 4 s (light travel time is negligible)
Distance = speed × time = 60 × 4 = 240 m
There is an explanation video available below.
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