American Heritage® Dictionary of the English Language, Fourth Edition
- n. The constant of proportionality relating the energy of a photon to the frequency of that photon. Its value is approximately 6.626 × 10-34 joule-seconds.
- n. physics the constant of proportionality (symbol h), relating the energy and frequency of a photon (6.626 x 10-34 joule-seconds); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action
- n. the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
- Named for Max Planck (1858–1947), German theoretical physicist, who discovered it in 1900. (Wiktionary)
- After Max Karl Ernst Ludwig Planck. (American Heritage® Dictionary of the English Language, Fourth Edition)
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