The distance of a galaxy is 56×1025m. Assume the speed of light to be 3×108ms−1. Express order of magnitude of time taken by light travelled to the galaxy.
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Solution
We know that: Time taken =distancetravelledspeed So, time taken =56×1025m3×108ms−1 So, the order is 18.6×1025−8sor1.86×1018s.