what does the term quantum mechanics mean
In the formalism of quantum mechanics, the state of a system at a given time is described by a complex wave function, also referred to as state vector in a complex vector space. This abstract mathematical object allows for the calculation of probabilities of outcomes of concrete experiments.uantum mechanics gradually arose from Max Planck 's solution in 1900 to the black-body radiation problem (reported 1859) and Albert Einstein 's 1905 paper which offered a quantum-based theory to explain the photoelectric effect (reported 1887). Early quantum theory was significantly reformulated in the mid-1920s.