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A child is $670 m$ away from an effigy in Dussehra celebrations after how many seconds he will hear the sound of explosion if the speed of sound is $332 m s^{- 1}$ 1.

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5 s

3 s

4 s

2 s

answer is D.

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Detailed Solution

2 s

, he will hear the sound of explosion during Dussehra celebrations.
Given,
The distance from the effigy,

s = 670 m

.
The speed of the sound,

v = 335 m s^{- 1}

.
From the relation of distance, speed and time,

Distance = time \times speed

Time = \frac{s}{v}

⇒

Time = \frac{670}{335}

⇒

Time = 2 s

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