MHT CET Physics question

The fraction of atoms of radioactive element that decays in 6 days is 7/8. The fraction that decays in 10 days will be

Answer: (C)

Solution

7/8 decayed means 1/8 = is left, so 3 half-lives = 6 days and = 2 days; in 10 days there are 5 half-lives, so = 1/32 is left and 31/32 has

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Question ID VK-084864