A sample of radioactive material has mass `m`, decay constant `lambda`, and molecular weight `M`. Avogadro constant `=N_(A)`. The initial activity of the sample is:

Options

A. `lambda m`
B. `(lambda m)/(M)`
C. `(lambda m N_(A))/(M)`
D. `mN_(A^(e^(lambda)))`

Answer

C

Explanation

Activity `= lambda N` where `N=(N_(A)m)/(M)`