Rohit was sitting beside the window when he saw a lightning. He started his stopwatch and found that after 22 seconds of lightning its thunder was heard. Given, Speed of light = 3 x $10^{8}$ $\frac{m}{s}$ and Speed of sound = $340 \frac{m}{s}$ .

How far are the source of thunder from Rohit?

10km

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8.5km

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7.5km

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5km

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Solution

The correct option is C
7.5km

As the speed of light is very high the time taken for light to travel from the clouds to Rohit is approximately 0 s. i.e. there is no time lag in the light reaching Rohit. We can say that lightning happened at t=0s and sound reached his ears at t=22s.

So the distance between him and the clouds is = 22 $\times$ 340 =7480m ≈ 7.5km.

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Rohit was sitting beside the window when he saw a lightning. He started his stopwatch and found that after 22 seconds of lightning its thunder was heard. Given, Speed of light = 3 x 108 ms and Speed of sound = 340ms. How far are the source of thunder from Rohit?

Rohit was sitting beside the window when he saw a lightning. He started his stopwatch and found that after 22 seconds of lightning its thunder was heard. Given, Speed of light = 3 x $10^{8}$ $\frac{m}{s}$ and Speed of sound = $340 \frac{m}{s}$ .

How far are the source of thunder from Rohit?