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Sound — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceSound1 Mark
Question
Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain?
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Answer

The speed of sound is $330m/s$ while that of light is $3\times 10^8m/s.$ Thus, speed of light is much higher than the speed of sound. This is the reason light reaches us before sound during a lightning.

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