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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound2 Marks
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 (344m/s) is less than the speed of light $(3\times10^8\text{m/s}).$ Sound of thunder takes more time to reach the Earth as compared to light. Hence, a flash is seen before we hear a thunder.

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