The application of the theory developed in paper I to problems of physical interest is considered and developed up to the point of finding the correlation matrix of the problem, thus reducing the complete solution to a matter of numerical computation. The considered cases are of rather large generality and refer to (a) fluctuation processes due to carrier trapping, (b) membrane noise, (c) spectral properties of linear atom chains, and (d) fluctuations in quantum systems whose Hamitonian contains an operator which is a random function of time. In the last case, the most general conditions under which the time evolution of a quantum system can be treated as a Markov process will be found and discussed.