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The fraction of the radioactive substances decayed in a time equal to the average life

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e−1e

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11−e

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detailed solution

Correct option is A

By definition, in a time t=1λ=τ , no. of atoms left undecayed is N=1eN0 or NN0=1e ∴ fraction of atoms decayed =1−1e=e−1e

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