The De Broglie wavelength in A.U. of an electron

Show that the De Broglie wavelength in A.U. of an electron where a narrow beam
of electrons is accelerated by a potential difference of V volts is given by

lemda = [12.28/V^(1/2)][eV/(2m_o c^2) +1]^(1/2)

The complete problem is in the attached file.

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