de Broglie Wavelength Calculator illustration

de Broglie Wavelength Calculator

Computes the de Broglie wavelength of a particle from its mass and either its speed or its kinetic energy.

Read the full guide to this tool

I know the

Particle mass (kg) Electron 9.109×10⁻³¹ kg, proton 1.673×10⁻²⁷ kg.

Speed (m/s)

Kinetic energy (eV)

Notes

λ = h/p: every moving object has a wavelength, but for anything larger than an atom it is far too small to notice.
Electron microscopes exploit the tiny de Broglie wavelength of fast electrons to beat the resolution of light.