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Grade -12 (NEB) > Science Physics Mechanical Waves, Waves

On a stormy day, a boy observes a lightning flash which is followed by thunder 3 sec later. How would you estimate the distance of the lightning strike from the boy?

On a stormy day, a boy observes a lightning flash which is followed by thunder 3 sec later. How would you estimate the distance of the lightning strike from the boy? (Given velocity of sound on that day = 332 m/s, velocity of light c = 3x108 m/s)

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Solution

Given,

Tike taken (t) = 3 sec
Velocity of sound (v) = 332 m/s
Distance travelled (d) = ?

We know,

d = v x t = 332 x 3 = 996 m

Hence, the source of thunder is about 996 m far from the boy.

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