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Photoelectrons ar ejected from a surface...

Photoelectrons ar ejected from a surface when light of wavelenght `lamda_1=550 nm` is incident on it. The stopping potential for such electrons is `lamda_(S1)=0.19V`. Suppose that radiation of wavelength `lamda_2=190nm` is incident of the surface.
Q. Calulate the work function of the surface.

A

3.75 eV

B

2.07 eV

C

4.20 eV

D

3.60 eV

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The correct Answer is:
B
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