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Q.

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

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a

300

b

400

c

500

d

600

answer is C.

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Detailed Solution

Eight minutes and twenty second means 500 s. ∴d=500cwhere, c= speed of light in vacuum which is taken as unity.Hence, d=500 units.

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