Question

For a radioactive sample, at given instant, number of active nuclei is N and its decay constant is $\lambda$ then the incorrect relation is -

• A. $N\lambda$=activity at given instant
• B. $\lambda$=decay probability per unit time for a nucleus
• C. After the next $\frac{1}{\lambda }$ time interval , active nuclei in the sample will be N$=(1-\frac{1}{e})$
• D. The half life of the sample$=\frac{n2}{\lambda }$

Answer 1

The correct option is A $N\lambda$=activity at given instant

For a radioactive sample, at given instant, number o f active nuclei is N and its decay constant is λ then the $N\lambda =activityatgivenins\tan tisincorrect.$

so that the correct option is A.