NEET Physics Nuclei Questions Solved


In a mean life of a radioactive sample 
(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

(b) By using N=N0e-λt and t=τ=1λ
Substance remains = N=N0e=0.37 N0N03
 Substance disintegrated = N0-N03=2N03

Difficulty Level:

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