Problem solving in physics is not simply a test of understanding of the subject, it is an integral part of learning it. In this book, the key ideas of quantum mechanics are well illustrated by a carefully chosen set of problems complete with detailed, step-by-step solutions. Beginning with a chapter on orders of magnitude, a variety of topics is then covered, including the mathematical foundations of quantum mechanics, Schrodinger's equation, angular momentum, the hydrogen atom, the harmonic oscillator, spin, time-independent and time-dependent perturbation theory, the variational method,...