Explanation

The basic theory of modern physics that studies the motion laws of microscopic particles. It was developed and established in the 1920s, including Schr ? dinger's wave mechanics and Heisenberg's matrix mechanics. Classical mechanics describes the motion of objects using coordinates and velocities, and their changes follow Newton's second law. quantum mechanics describes the movement of objects based on the wave particle duality of microscopic particles (electrons, atoms, molecules or other basic particles). Firstly, wave dynamics uses a probability wave to describe the state of microscopic particles. The spatiotemporal variation of the wave function follows the Schr ? dinger equation. Secondly, quantum mechanics uses operators to represent mechanical quantities (coordinates, momentum, energy, etc. are all introduced with corresponding operators). The mechanical quantity of a particle in a certain state generally does not have a definite value, but rather has a series of possible values, namely the eigenvalues of the operator; The measurement results are statistically significant. quantum mechanics is mainly to solve the Schrodinger equation under given conditions, obtain the wave function, and predict the measurement results of physical quantities. quantum mechanics not only has strict solutions to simple problems (such as revealing the quantization of electronic energy level orbits in atoms, energy level of harmonic oscillators, tunneling effects, etc.), but also has approximate solutions to complex systems, the latter being the basis of condensed matter physics, nuclear physics, and quantum chemistry.

Classification