Photons with energy $$5$$ eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is $$2$$ eV. When photons of energy $$6$$ eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is

Question

Photons with energy $$5$$ eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is $$2$$ eV. When photons of energy $$6$$ eV are incident on  C, no photoelectrons will reach the anode A, if the stopping potential of  A relative to C is

Infinity Learn · Accepted Answer

According Einstein's photoelectric equation kinetic energy of photoelectrons,$$KEmax=Ev-$$ϕ or, $$2=5-$$ϕ  ∴ϕ$$=3eV$$ When $$Ev=6eV$$ then   $$KEmax=6-3=3eV$$ or, eVcathode $$-Vanode$$ $$=3eV$$ or, Vcathode $$-Vanode$$ $$=3$$ $$V=-Vstopping$$ ∴Vstopping $$=-3$$ V

Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is

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