Question 15
Sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = $340 m s^{- 1}$ )

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Solution

Given, time taken by the sound after lightening = 10 seconds
Speed of the sound $= 340 m s^{- 1}$ .
Let $s$ be the distance travelled.
We know, $s p e e d = \frac{d i s t a n c e}{t i m e}$
$∴$ $d i s t a n c e = s p e e d \times t i m e$
$\Rightarrow D i s t a n c e, s = 340 \times 10 = 3400 m$ or $3.4 k m$

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Speed of Sound

Standard VIII Physics

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Question 15 Sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = 340 ms−1)

Given, time taken by the sound after lightening = 10 seconds Speed of the sound =340 ms−1. Let s be the distance travelled. We know, speed=distancetime ∴ distance=speed×time ⇒Distance,s=340×10=3400 m or 3.4 km

Question 15
Sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = $340 m s^{- 1}$ )