Relativistic corrections become necessary when the expression for the kinetic energy ½ mv², becomes comparable with mc², 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 = 10⁻²nm
(C) λ = 10⁻⁴nm
(D) λ = 10⁻⁶nm