| 单词 | Planck constant |
| 释义 | Planck constant Symbol h. The fundamental constant equal to the ratio of the energy E of a quantum of energy to its frequency v: E = hv . It has the value 6.626176 × 10-34 J s. It is named after Max Planck. In quantum-mechanical calculations (especially particle physics) the rationalized Planck constant ℏ= h/2π = 1.054589 × 10-34 J s is frequently used. It is also known as the Dirac constant |
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