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NEET 2013 Physics question

PhysicsNucleiNEET 2013

The half-life of a radioactive isotope is 20 years. It decays to another element which is stable. The two elements and were found to be in the ratio in a sample of a given rock. The age of the rock is estimated to be -

Answer: (2)

Solution

Every atom of that decays becomes , so the number of atoms originally present was . With , the fraction of remaining is $ = = Missing argument for \dfrac\dfrac18 =

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Question ID VK-091329