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MHT CET Physics question

PhysicsNucleiMHT CET

The half-life of a radioactive isotope X is 20 yr. It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be [MHTCET 2013]

Answer: (B)

Solution

X : Y = 1 : 7 means 1/8 of the original X is left, , so 3 half-lives = 60 yr; 40 yr would

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Question ID VK-084923