How far away did the lightning strike if it took 3 seconds to hear the thunder?

approx. 0.3 km

approx. 1 km

approx. 3 km

approx. 9 km

Sound travels through air at 331.2 meters per second, so after 3 seconds it would travel approximately 1 kilometer.

Ninjai

wikimedia wikipedia → Speed of sound

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100%

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26%

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41%

34%

11%

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40%

252

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3039

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163

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