In a mean life of a radioactive sample

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About 1/3 of substance disintegrates

About 2/3 of the substance disintegrates

About 90% of the substance disintegrates

Almost all the substance disintegrates

answer is B.

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Detailed Solution

By using N=N0e-λt and t=τ=1λSubstance remains N=N0e=0.37N0≃N03∴Substance disintegrated =N0-N03=2N03

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