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Q.

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. This is because


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a

The speed of sound is greater than the speed of light

b

The speed of sound is equal to the speed of light

c

The speed of light is much greater than the speed of light

d

None of these 

answer is C.

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Detailed Solution

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. This is because the speed of light is much greater than the speed of light.
The speed of light in the air (3×108 m/s) is much faster than the speed of sound in the air (330 m/s).
As a result, even though flash and thunder are produced simultaneously, light (flash) reaches the earth's surface slightly before sound (i.e. thunder).
As a result, thunder is heard a few seconds after the flash.
 
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Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. This is because