A radioactive element has decay constant \(\lambda \) (expressed in s^–1). The number of nuclei of this element at t = 0 is N. What is the expected number of nuclei that will have decayed after 1 s?

A.  \(N\left( {1 - {e^{ - \lambda }}} \right)\)

B.  \(\frac{N}{\lambda }\)

C.  \(N{e^{ - \lambda }}\)

D.  \(\lambda N\)

A