Photon having energy equivalent to the binding energy of 4 th state of \( \mathrm{He}^{+} \)atom...

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Photon having energy equivalent to the binding energy of 4 th state of \( \mathrm{He}^{+} \)atom is used to eject an electron from the metal surface of work function \( 1.4 \mathrm{eV} \). If electrons are further accelerated through the potential difference of \( 4 \mathrm{~V} \) then the minimum value of De-broglie wavelength associated with the electron is :
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