hw2 (2) - What are the kinetic energies of the fastest and...

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EE 439 — Fall 2009 HW problem 2 Name(s) __________________________________. Due: Oct. 7, 2009 Please put your answers on this sheet. Staple additional work behind. Be sure to include all your work. Light with a wavelength of 200 nm falls on an aluminum surface. The minimum photon energy required to remove an electron from Al is 4.2 eV.
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Unformatted text preview: What are the kinetic energies of the fastest and slowest emitted photoelectrons? What is the stopping potential (i.e. the applied voltage needed to make the photocurrent go zero)? What is the cutoff wavelength for Al? If the intensity of the light hitting the surface is 2 W/m 2 , what is photon flux?...
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