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Speed of Sound vs Speed of Light

A time keeper...

Question

A time keeper in a 100 m run is advised to start the stop watch by seeing the smoke from the starter's gun and not b hearing the sound of fire. Why?

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Solution

Because when gun is fired , sound takes some time to reach to the listener (time keeper) , so if he wait for the sound , he will be late a bit . Whereas smoke comes out from the gun just after the fire .

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