Modern Physics
Photon Energy (Planck)
Energy of a photon is proportional to its frequency. Foundation of quantum theory.
Variables
EJ
Photon energy
hJ·s
Planck constant
fHz
Frequency
cm/s
Speed of light
\lambdam
Wavelength
Derivation
Introduced by Planck to explain blackbody radiation.
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Common questions
What is the Photon Energy (Planck) formula?
Photon Energy (Planck) is written E = hf = hc/λ. Energy of a photon is proportional to its frequency. Foundation of quantum theory. It belongs to Modern Physics, under Quantum Mechanics.
What are the units in E = hf = hc/λ?
In SI units, E is photon energy, measured in J; h is planck constant, measured in J·s; f is frequency, measured in Hz; c is speed of light, measured in m/s; \lambda is wavelength, measured in m.
How is the Photon Energy (Planck) formula derived?
Introduced by Planck to explain blackbody radiation. The result is E = hf = hc/λ.