Example 1
A 500 nm photon carries about 3.97 × 10⁻19 J, or 2.48 eV.
Mendeleev
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Physics tools › Photon energy
Mendeleev · Physics
Photon energy
Photon energy is proportional to frequency and inversely proportional to wavelength.
Formula usedE = hc/λ
Visual cue · spectrum / wave
Calculate
Photon energy
What do the symbols mean?
Ephoton energy
λwavelength
Two worked examples
Example 2
Doubling frequency doubles photon energy and halves wavelength in vacuum.
Good to knowThe relation E = hc/λ uses the wavelength in vacuum. The calculator uses the exact SI values of h and c.