Which of the following expressions correctly gives the activity of a radioactive…

PHYSICS · Single correct · CBSE · Physics · Nuclei · Nuclei

Problem

Which of the following expressions correctly gives the activity

A

of a radioactive sample in terms of its decay constant

\lambda

and the number of undecayed nuclei

N

? (a)

-\lambda N

(b)

0.693\,\lambda N

(c)

\lambda N

(d)

\dfrac{N}{\lambda}