The work function for platinum is 635 ev ultraviolet light, Ask an Expert

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The work function for platinum is 6.35 eV. Ultraviolet light of wavelength 150 nm is incident on the clean surface of a platinum sample. We wish to predict the stopping voltage we will need for electrons ejected from the surface.

(a) What is the photon energy of the ultraviolet light?

(b) How do you know that these photons will eject electrons from platinum?

(d) What stopping voltage would be required to arrest the current of photoelectrons?

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