After 22 seconds of lightning, a thundering sound was heard. Calculate the height of the clouds which caused this lightning. Given,
Speed of light = 3 x $10^{8}$ m/s and Speed of sound = 340 m/s.

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

Since the time taken for light to travel from clouds to earth is approximately 0, we can say that lightning happened at t = 0, and sound reached our ears in 22 s. So height of clouds = 22 x 340 = 7480m ≈ 7.5 km.

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After 22 seconds of lightning, a thundering sound was heard. Calculate the height of the clouds which caused this lightning. Given, Speed of light = 3 x 108 m/s and Speed of sound = 340 m/s.

The correct option is C 7.5km Since the time taken for light to travel from clouds to earth is approximately 0, we can say that lightning happened at t = 0, and sound reached our ears in 22 s. So height of clouds = 22 x 340 = 7480m ≈ 7.5 km.

After 22 seconds of lightning, a thundering sound was heard. Calculate the height of the clouds which caused this lightning. Given,
Speed of light = 3 x $10^{8}$ m/s and Speed of sound = 340 m/s.

The correct option is C
7.5km

Since the time taken for light to travel from clouds to earth is approximately 0, we can say that lightning happened at t = 0, and sound reached our ears in 22 s. So height of clouds = 22 x 340 = 7480m ≈ 7.5 km.