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10/01/2021 10:24 am
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A child watching Dussehra celebration from a distance sees the effigy of Ravana burst into flames and hears the explosion associated with it 2 sec after that. How far was he from the effigy if the speed of sound in air that night was 335 m/sec?
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10/01/2021 10:27 am
Speed of sound in air = 335 m/s
Time required to reach the sound = 2 sec
Distance of the source of sound = ?
∴ Speed = \(\frac{Distance}{Time}\)
∴ Distance = Speed x Time
= 335 x 2 sec
= 670 m
A child was 670 m away from the spot where effigy burnt.