Planck constant
E28819
The Planck constant is a fundamental physical constant that quantifies the relationship between the energy of a photon and the frequency of its associated electromagnetic wave, forming a cornerstone of quantum mechanics.
Aliases (2)
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
fundamental constant
→
physical constant → physical constant → quantum constant → |
| appearsIn |
blackbody radiation theory
→
photoelectric effect theory → |
| appearsInEquation |
Bohr model energy levels
→
Heisenberg uncertainty principle → Planck radiation law → Planck–Einstein relation → Schrödinger equation → de Broglie wavelength formula → |
| category |
Fundamental constants of nature
→
|
| CODATA2018Value |
6.62607015×10^-34 J·s (exact)
→
|
| definedAs |
h / 2π
→
|
| definesRelation |
E = h f
→
E = h ν → |
| dimension |
action
→
|
| dimensionSymbol |
M L^2 T^-1
→
|
| field |
physics
→
quantum mechanics → |
| fixedBy |
2019 SI redefinition of base units
→
|
| hasExactValue |
6.62607015e-34 joule second
→
|
| hasExactValueSI |
6.62607015×10^-34 J·s
→
|
| hasReducedForm |
reduced Planck constant
→
|
| hasUnit |
joule second
→
|
| hasUnitSymbol |
J·s
→
|
| historicalYearIntroduced |
1900
→
|
| introducedBy |
Max Planck
→
|
| isCornerstoneOf |
photon theory of light
→
quantum theory → |
| isExactByDefinition |
true
→
|
| isInvariant |
Lorentz invariant
→
|
| isQuantumOf |
action
→
|
| isUniversal |
true
→
|
| namedAfter |
Max Planck
→
|
| relatedConstant |
reduced Planck constant
→
|
| relatesQuantity |
electromagnetic wave frequency
→
photon energy → |
| symbol |
h
→
ħ → |
| usedIn |
particle physics
→
quantum field theory → solid-state physics → spectroscopy → |
| usedToDefine |
Planck units
→
joule → kilogram → |