| 单词 | planck's constant |
| 释义 | > as lemmasPlanck's constant Planck's constant n. (also Planck constant) a physical constant relating the energy E of a quantum of electromagnetic radiation to its frequency ν according to the equation E = hv, where h is Planck's constant.In 2018 the General Conference on Weights and Measures agreed that, as part of the redefinition of the kilogram, the value of Planck's constant would from May the following year be set at exactly 6.62607015 × 10–34 joule-seconds per cycle, having previously been given as 6.626070150(81) × 10–34 J s (where the figure in parenthesis represents the standard uncertainty due to measurement errors).extracted from Planckn.< as lemmas |
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