The time interval between a lightning flash and the first sound of thunder is 5 s. If the speed of sound in air is 330 m $s^{- 1}$ , find the distance of flash from the observer.

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Solution

Since light travels at a much faster speed as compared to sound, time taken for light to reach the earth's surface is negligible.

Speed of sound in air (V) = 330 m/s
Time in which thunder is heard after lighting is seen (t) = 5 s
Thus, distance between flash and observer = V $\times$ t = 330 $\times$ 5 = 1650 m

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The time interval between a lightning flash and the first sound of thunder is 5 s. If the speed of sound in air is 330 m s−1, find the distance of flash from the observer.

The time interval between a lightning flash and the first sound of thunder is 5 s. If the speed of sound in air is 330 m $s^{- 1}$ , find the distance of flash from the observer.