Photon having energy equivalent to the binding energy of 4th state of

1.	Photon having energy equivalent to the binding energy of 4th state of He+ atom is used to eject an electron from the metal surface of work function 1.4 EV. if the electrons are further accelerated through the potential difference of 4v then the minimum value of de Broglie wavelength associated with the electron is
Answer» 12mv2max=hv−ϕ∘=4eV−2eV=2eV Now, eV∘=2eV ⇒V∘=2V Hope HELPS

Photon having energy equivalent to the binding energy of 4th state of He+ atom is used to eject an electron from the metal surface of work function 1.4 EV. if the electrons are further accelerated through the potential difference of 4v then the minimum value of de Broglie wavelength associated with the electron is

Answer»

12mv2max=hv−ϕ∘=4eV−2eV=2eV

Now, eV∘=2eV

⇒V∘=2V