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Q.

A new unit of length is chosen such that the speed of light in vacuum is unity. If light takes 8 min and 20 s to cover distance between the sun and the earth, that distance in terms of the new unit will be 

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a

5

b

50

c

500

d

5000

answer is C.

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Detailed Solution

We know that 

Distance=Speed×time

 Speed is unity =1 unit /sec T ime =8min and 20sec=8×60+20sec=500sec After putting values  Distance between Sun and Earth =1×500=500 units 

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