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NEET 2012 Physics question

PhysicsNucleiNEET 2012

The half life of a radioactive nucleus is days. The time interval between the time when of it has decayed and the time when of it had decayed is:

Answer: (3)

Solution

When has decayed, of the nuclei remain: . When has decayed, remains: $Missing argument for \tfrac\tfrac =

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Question ID VK-091092