Photon Energy (Planck)

E = h f = \frac{h c}{λ}

Energy of a photon is proportional to its frequency. Foundation of quantum theory.

Variables

E

Photon energy

J

h

Planck constant

J·s

f

Frequency

Hz

c

Speed of light

m/s

\lambda

Wavelength

m

Derivation

Introduced by Planck to explain blackbody radiation.

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