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Q.

Is it true that a few seconds after the lightning flare, thunder can be heard?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is  True.
Thunder and lightning both occur at the same moment when lightning strikes. Since light travels more quickly than sound, a flash can be seen practically immediately after a lightning strike. However, after a few seconds of lightning, thunder can be heard. Since the speed of light (c=3×108 m/s) is greater than the speed of sound (330 m/s)light moves more quickly than sound.
 
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