Planck's constant
Meanings
name
- the constant of proportionality (symbol ℎ), relating the energy and frequency of a photon (6.626×10⁻³⁴ joule-second); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action
Pronunciation
Word forms
Etymology
Named for Max Planck (1858–1947), German theoretical physicist, who discovered it in 1900.
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