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MHT CET Physics question

PhysicsNucleiMHT CET

The half-life of a radioactive substance is 40 years. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant?

Answer: (C)

Solution

One fourth remains after 2 half-lives, so years, and \frac{0.693}{40}$=0.0173\

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Question ID VK-084667