Silver has a work function of 4.7 eV . When ultraviolet light of wavelength 100 nm is incident upon it, potential of 7.7 V is required to stop photoelectrons from reaching the collector plate. The pot

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Silver has a work function of 4.7 eV . When ultraviolet light of wavelength 100 nm is incident upon it, potential of 7.7 V is required to stop photoelectrons from reaching the collector plate. The potential required to stop electrons when light of wavelength 200 nm is incident upon silver is

TestHub · Accepted Answer

Given: λ = 100 nm = 1000 A ˚ Energy corresponding to 1000 A ˚ = 1000 12375 ​ = 12.375 eV Now, 7.7 = 12.375 − ϕ 0 ​ or ϕ 0 ​ = 12.375 − 7.7 = 4.675 eV In the second case, Energy corresponding to 2000 A ˚ = 2000 12375 ​ eV = 6.1875 eV Now, 4.7 = 6.1875 − ϕ 0 ′ ​ or ϕ 0 ′ ​ = 6.1875 − 4.7 = 1.4875 ≃ 1.5 V

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