Photons of 4.25 eV eject electrons from metal A with maximum kinetic energy T A and wavelength λ A . Photons of source-printed energy 4.7V eject electrons from B with T B = T A − 1.5 eV and λ

Question

Photons of 4.25 eV eject electrons from metal A with maximum kinetic energy T A ​ and wavelength λ A ​ . Photons of source-printed energy 4.7V eject electrons from B with T B ​ = T A ​ − 1.5 eV and λ B ​ = 2 λ A ​ . Find B's work function.

TestHub · Accepted Answer

λ=h/√(2mT) implies T_B=T_A/4. Together with T_B=T_A-1.5 eV, this gives T_A=2.0 eV and T_B=0.5 eV. Work function of B=4.7-0.5=4.20 eV. Source '4.7V' is interpreted as 4.7 eV photon energy; its printed unit is erroneous.

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