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

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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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