Relativistic corrections become neccssary when the expression for the kinetic energy 1/2 mv^{2} , becomes comparable with mc^{2}, where m is the mass of the particle. At what de Broglie wavelength will relativistic corrections become important for an electron?

(a) λ =10nm (b) λ =10^{–1}nm (c) λ =10^{–4}nm (d) λ =10^{–6}nm