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
Correct Answer: B
Solution :
[b] By using \[N={{N}_{0}}{{e}^{-\lambda t}}\] and \[t=\tau =\frac{1}{\lambda }\] Substance remains \[N=\frac{{{N}_{0}}}{e}=0.37{{N}_{0}}\simeq \frac{{{N}_{0}}}{3}\] \[\therefore \]Substance disintegrated \[={{N}_{0}}-\frac{{{N}_{0}}}{3}=\frac{2{{N}_{0}}}{3}\]
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