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  • Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping potential of photoelectrons is 0.38 V. Find the work function of the emitter.

Q: 11.11 Light of wavelength 488\hspace{1mm}nm is produced by an argon laser which is used in the  photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38\hspace{1mm}V. Find the work function of the material from which the emitter is made. 

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The energy of incident photons is given by

\\E=\frac{hc}{\lambda }\\ E=\frac{6.62\times 10^{-34}\times 3\times 10^{8}}{488\times 10^{-9}\times 1.6\times 10^{-19}}\\ E=2.54\ eV

Cut-off potential is 0.38 eV

Work function is therefore, 2.54-0.38= 2.16 eV

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