Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?

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Solution

Comparison of thunder and lightning
Thunder and lightning are formed simultaneously.
We know that the speed of light in air is $3 \times 10^{8} m / s$ .
The speed of sound in air is $330 m / s$ .
Since, the speed of light is much greater than the speed of sound, so during lightning, the flash is observed way before the thunder is heard.

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