Science Constants - Compton Wavelength of Electron Symbol: λc Value: 2.426310215(18) × 10-12 m Category: - Electron Particle Constants Description: The Compton Wavelength is the wavelength associated with the mass of any particle, given by λ = h / mc, where h is Planck's Constant, m is the mass of the particle and c is the speed of light. The value quoted above is the Compton Wavelength for an electron particle.