Consider the following nuclear decay: A B C in which the nuclei A and B decay with decay constants A and AB, respectively. Nucleus C is stable. (a) Show that in terms of the fraction of nuclei A that hasn't decayed, the number of nuclei of B is given by: NB No- where f is the fraction of A that hasn't decay and No is the initial number of nuclei A. Assume that initially there was no nuclei B or C.