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Light of wavelength 1824 Å, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength 1216 Å is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is (approximately) in eV. (use hc = 12400 eVÅ)

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answer is 0001.50.

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Detailed Solution

KEmax=hCλ−ϕ5.3=124001824−ϕ .........(1)8.7=124001216−ϕ .........(2)Solving above equations we getϕ=1.50eV

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Light of wavelength 1824 Å, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength 1216 Å is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is (approximately) in eV. (use hc = 12400 eVÅ)