A stream of electrons from a heated filament was passed between two charged plates kept at a pot....

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A stream of electrons from a heated filament was passed between two charged plates kept at a potential
\( \mathrm{P} \)
difference \( \mathrm{V} \) esu. If \( \mathrm{e} \) and \( \mathrm{m} \) are charge and mass of an electron, respectively, then the value of \( \mathrm{h} / \lambda \) (where \( \lambda \) is wavelength associated with electron wave) is given by:
(1) \( \sqrt{2 \mathrm{meV}} \)
(2) \( \mathrm{meV} \)
(3) \( 2 \mathrm{meV} \)
(4) \( \sqrt{\mathrm{meV}} \)


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