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Question

Light takes approximately 8 minutes to reach the earth from Sun. The distance between earth and Sun in kilometers is ______. (speed of light= 3$$ \times $$ 10$$^8$$ ms$$^{-1}$$ )


A
1440 × 108 m
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B
14 × 108 m
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C
140 × 108 m
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D
4 × 108 m
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Solution

The correct option is A 1440 $$\times $$ 10$$^8$$ m
The distance between the earth and the sun $$d=$$ velocity of light $$\times $$ time taken to reachlight form sun to earth
or $$d=(3\times 10^8 m/s)\times (8\times 60 s)=144\times 10^9 m=144\times 10^6 km$$


Physics

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