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Q.

In a mean life of a radioactive sample

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a

About 1/3 of substance disintegrates

b

About 2/3 of the substance disintegrates

c

About 90% of the substance disintegrates

d

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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