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Relativistic corrections become neccssary when the expression for the kinetic energy 1/2 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 =10–1nm (c) λ =10–4nm (d) λ =10–6nm

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(c), (d)

(c) λ =10–4nm (d) λ =10–6nm

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