the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second 同义词:Planck''s constant,
百科解释
H (named aitch , plural aitches;"H" Oxford English Dictionary, 2nd edition (1989); Merriam-Webster's Third New International Dictionary of the English Language, Unabridged (1993); "aitch", op. cit.