when lightning strikes, it causes air to become heated to an extremely high temp

Question

when lightning strikes, it causes air to become heated to an extremely high temperature in a short amount of time, rapidly expanding the air. This explosive is the source of Thunder. The light from the lightning travels in the air at 3 x 10 to the 8th power meters per second in the sound of the Thunderclap travels in air at 343 meters per second. If you are standing 5200 away from the storm, approximately how much time passes between you seeing the flash of lightning and you hearing the sound of thunder? Round to the nearest second.

Explanation / Answer

time taken by sound of thunder = 5200/343 = 15 s

time taken by light is negligible.

So time passes in between = 15 s answer

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