| 单词 | quantum theory |
| 释义 | quantum theory The theory devised by Max Planck in 1900 to account for the emission of the black-body radiation from hot bodies. According to this theory energy is emitted in quanta (see quantum), each of which has an energy equal to hv, where h is the Planck constant and v is the frequency of the radiation. This theory led to the modern theory of the interaction between matter and radiation known as quantum mechanics, which generalizes and replaces classical mechanics and Maxwell's electromagnetic theory. In nonrelativistic quantum theory particles are assumed to be neither created nor destroyed, to move slowly relative to the speed of light, and to have a mass that does not change with velocity. These assumptions apply to atomic and molecular phenomena and to some aspects of nuclear physics. Relativistic quantum theory applies to particles that travel at or near the speed of light |
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