Energy to Wavelength
λ = hc / E
How to Use This Calculator
Enter photon energy and choose the unit (eV or J). The tool computes the corresponding wavelength in nanometers.
Formula
λ = hc / E
Where h is Planck's constant and c is the speed of light.
Frequently Asked Questions
Which spectrum range?
Energy determines wavelength: higher energy → shorter wavelength. Visible light spans ~1.65 eV (750 nm) to ~3.26 eV (380 nm).