PhysicsLAB AP Free Response Question
2010 Form B - B7

 
 
Your teacher gives you the above graph of stopping potential versus frequency for the photoelectric effect.
 
 (a) Calculate the work function of the metal in eV.

 (b) If the stopping potential is 1.5 V, determine the maximum kinetic energy of the emitted photoelectrons in eV.

 (c) Calculate the wavelength of light that will eject photoelectrons with the maximum kinetic energy found in part (b).

 
(d) What would be the wavelength of light that will eject photoelectrons with a lower maximum kinetic energy than that found in part (b)?
 
 
Explain your reasoning.
 





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