Photoelectrons are ejected from a surface when light of wavelength \( \lambda_{1}=550 \mathrm{~n....

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Photoelectrons are ejected from a surface when light of wavelength \( \lambda_{1}=550 \mathrm{~nm} \) is incident on it. The stopping potential for such electrons is \( \mathrm{V}_{\mathrm{s} 1}=0.19 \mathrm{~V} \). Suppose that
P
radiation of wavelength \( \lambda_{2}=190 \mathrm{~nm} \) is incident on the surface.

Calculate the work function of the surface.
(1) \( 3.75 \mathrm{eV} \)
(2) \( 2.07 \mathrm{eV} \)
(3) \( 4.20 \mathrm{eV} \)
(4) \( 3.60 \mathrm{eV} \)


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