Electromagnetic radiation is incident on the surface S of amaterial as shown abo

Question

Electromagnetic radiation is incident on the surface S of amaterial as shown above. Photoelectrons are emitted from thesurface S only for radiation of wavelength 500 nm or less. Itis found that for a certain ultraviolet wavelength, which isunknown, a potential Vs of 3 volts is necessary to stopthe photoelectrons from reaching the anode A, thus eliminating thephotoelectric current.

a.    Determine the frequency of the 500 nmradiation.

b.    Determine the work function for thematerial.

c.    Determine the energy of the photonsassociated with the unknown wavelength.

d.    Determine the unknown wavelength.

Explanation / Answer

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