Question

Question 2.5 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?

Class XI Physics Units And Measurements Page 35

Answer 1

Distance b/w sun and earth
= speed of light × time taken to reach to earth

given new unit of speed = 1 unit
time = 8 min 20s = 500 s

so dis. = speed × time
=> 500units

Answer 2

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Distance between the Sun and the Earth

= Speed of light × Time taken by light to cover the distance

Given that in the new unit, speed of light = 1 unit

Time taken, t = 8 min 20 s = 500 s

Distance between the Sun and the Earth = 1 × 500 = 500 units

I hope, this will help you

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