A first course on quantum mechanics describing simple applications to physical phenomena that are of immediate and everyday interest such as transistors, lasers, molecular binding, magnetic resonance imaging and alpha decay. The first five chapters introduce fundamentals and are followed by a revision quiz with which readers may test their understanding. The remaining chapters describe applications. Ideal either as a course text or a self-study text, the book contains nearly 100 exercises and hints to their solution. It will be valuable for undergraduate students at 2nd or 3rd year in physics, electronic engineering, mathematics, chemistry.