Physics

Problem

Which expression gives the total number of nuclei that disintegrate during a time interval

t

when the initial number of undecayed nuclei is

N_0

and the decay constant is

\lambda

? a)

\displaystyle \Delta N = N_0 e^{-\lambda t}

\displaystyle \Delta N = N_0\bigl(1-e^{-\lambda t}\bigr)

\displaystyle \Delta N = N_0\lambda t

\displaystyle \Delta N = N_0(\lambda t) e^{-\lambda t}