According to de Brogue equation, A = h/mv

Mass of electron = 9.1 x 10^{-31} kg; Planck’s constant 6.626 x 10^{-34} kg m^{2} s^{-1}

Velocity of electron = 1% of speed of light

= 3.0 x 10^{8} x 0.01 = 3 x 10^{6} ms^{-1}

Wavelength of electron (λ) = h/mv

= 2.43 x 10^{-10} m