Photon energy
Photon energy: use vacuum wavelength. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
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Formula & explanation
E = hc/λ; h = 6.62607015×10⁻³⁴, c = 299792458
Variables & units
- Vacuum wavelength
- nm · minimum 5e-324, maximum 1000000000000
Worked example
Use the displayed example inputs, then follow the substituted values in the solution.
Assumptions
Vacuum wavelength; uses exact SI Planck constant and speed of light.
References
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
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