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Photon Energy, Frequency and Vacuum Wavelength

Calculate photon energy, frequency and vacuum wavelength with compatible units, known-value inputs and clearly stated model assumptions.

Formula & worked example
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Calculator inputs

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How to use this calculator

Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

For the worked inputs, Energy is approximately 4.1356677e+5 ueV.

E = hf; λ = c/f

Worked example

Enter these known values and leave the other values blank.

Frequency: 100000 GHz

Energy: 413567 μeV
Wavelength: 0.002997925 mm

Assumptions and limitations

The model describes photons in vacuum. Frequency stays fixed across a boundary, while wavelength in a material depends on refractive index.
Energy is positive and the electron-volt conversion uses the exact elementary charge.
Numerical arithmetic uses 64 significant digits; displayed values are rounded separately. Captured particle-mass and astronomical unit conversions retain their stated approximations.

Common questions

Which inputs and assumptions does this result use?

The model describes photons in vacuum. Frequency stays fixed across a boundary, while wavelength in a material depends on refractive index.

References

Bookify retains the captured physical relationship and inverse controls, while replacing older or rounded constants with the 2022 CODATA values and full-precision π where applicable. Measured constants retain their physical uncertainty.

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