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In rainy season flashes of lightning is ...

In rainy season flashes of lightning is seen at first, but the sounds piercing the sky are heard afterwards.

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Velocity of flashes of lightning, 1.e., velocity of light is `3 xx 10 ^(8) ms ^(-1),` while velocity of sounds piercing sky, i.e., velocity of sound is `340 ms ^(-1).` Hence velocity of light is `10^(6)` times the velocity of sound. So light reaches earth earlier than sound.
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