Quantum mechanics book with heavy emphasis on applications. Focuses on the physics of the applications, rather than on the mathematical structure. Order of magnitude estimates of effects are presented and calculated in detail. Nonclassical results are reconciled with classical expectations. In addition to core material, this edition contains new material on degenerate matter, the integral Quantum Hall Effect, the Einstein derivation of stimulated emission, lasers and the density matrix, exponential decay, and more. Features 60% more problems.