Quantum mechanics is widely recognized as the basic law which governs all of nature, including all materials and devices. It has always been essential to the understanding of material properties, and as devices become smaller it is also essential for studying their behavior. The idea of applied quantum physics is inspiring scientists in physics and electrical engineering worldwide and forms a major thrust of lively research today. This is a collection of solved problems of several degrees of difficulty in Quantum Mechanics, ranging from the themes of the crisis of classical physics, through the achievements in the framework of modern atomic physics, down to the still alive, more intriguing aspects connected. Detailed descriptions of the solutions to exercises are provided. This is an absolute reference for electrical and mechanical engineers, material scientists and applied plied physicists who will find it easy to apply the problems to daily applications of quantum science.