Units and Measurement
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Question : 5
Total: 33
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?
Solution:
According to problem, speed of light in vacuum, c = 1 s – 1
Time taken by light to cover distance between sun and the earth.
t = 8 min 20 s = 500 s
∴ Distance between sun and earth= c × t = 1 × 500 s = 500
Time taken by light to cover distance between sun and the earth.
∴ Distance between sun and earth
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