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Question
The distance of a galaxy is 5·6 × 1025 m . Assuming the speed of light to be 3 × 108 `"ms"^-1`. Find the time taken by light to travel this distance .
[Hint : `"Time taken" = "Distance travelled"/"speed"`]
Solution
Distance of galaxy = 5.6 × 1025 m
Speed of light = 3 × 108 m/s
`"Time taken by light" = "Distance travelled"/"speed of light"`
= `((5.6 × 10^25)/ (3 × 10^8))` s
= 1.87 × 1017 s
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