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A boy watching Ravan Dahan sees the effigy burst into flames and hears the explosion associated with it in $2 s$ times after the burst. Which of the following options is correct for the boy's distance from the effigy if the speed of sound in the air is $340 m / s$ ?

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650 m

700 m

680 m

525 m

answer is C.

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Detailed Solution

The distance of the boy from the effigy is

680 m

.
Given,
Time,

t = 2 s

and speed,

v = 340 m / s

It is known that

Speed (v) = \frac{distance (d)}{time taken (t)}

Or it can be written as

d = v \times t

On substituting the given values, we get the distance travelled as

\Rightarrow d = 340 \times 2

\Rightarrow d = 680 m

Hence, the distance of the boy from the effigy is

680 m

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