Why are Operators Used in Quantum Mechanics? This post can be found here: http://physics.stackexchange.com/questions/77275/why-do-we-use-operators-in-quantum-mechanics  Q:In classical mechanics, physical quantities, such as, e.g. the coordinates of position, velocity, momentum, energy, etc, are real numbers, but in quantum mechanics they become operators. Why is this so? A:  The short answer is that you can treat classical observables as operators if … Continue reading Interesting Answers to Quantum Mechanics Questions →