A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V volt. If 'e' and m are charge and mass of an electron, respectively, then

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A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V volt. If 'e' and m are charge and mass of an electron, respectively, then the value of h / λ (where λ is wavelength associated with electron wave) is given by:

TestHub · Accepted Answer

As electron of charge ' e ' is passed through ' V ' volt, kinetic energy of electron will be eV . Wavelength of electron wave ( λ ) = 2 m ⋅ KE ​ h ​ λ = − 2 m eV ​ h ​ ∴ λ h ​ = 2 m eV ​

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