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Flash and thunder are produced simultaneously. But thunder is ... - Science
Question
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
Answer
The speed of sound in air is approximately 344 m/s.
The speed of light is 3 \times 10^8 m/s (300,000,000 m/s).
Reason:
Since the speed of light is much greater than the speed of sound, light reaches us almost instantly, while sound takes some time to travel the same distance. That is why thunder is heard a few seconds after the flash is seen.