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Q.

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)


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a

1.7 km

b

17 km

c

3.4 km

d

34 km 

answer is C.

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Detailed Solution

Given that, Speed of sound, a = 340 m/s       (where a = acceleration = distance/time = speed)
Time period, t = 10 s
We know that,
Speed = DistanceTime                  a = dt
Distance = Speed × Time
                 d = a × t
⸫ d = 340 × 10 = 3400 m = 3.4 km
Hence, the approximate distance of the thunder cloud will be 3.4 km.
 
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