A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h/λ is given as?

Kinetic energy = eV = 1/2mu<sup>2</sup>

u = √2eV/m eq.1

Where u is the velocity of the electrons

From de Broglie wavelength, λ = h/mu

h/λ = mu eq.2

Substituting eq.1 in eq.2

h/λ=m√2eV/m = √2meV

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