The Rayleigh-Jeans equation agrees with the experimental blackbody spectrum a wavelengths, but fails at_ wavelenghts Photoelectric Effect Practice Questions: 1. What is the KE of phototelectron if it would require an opposing voltage of -0.50V to preven it from reaching the collector? How would you determine its velocity? 2. What is the slope of the graph of KE vs. frequency graph for photoelectric effect? How does the slope change with variation of the metal surface (ex. Copper vs. Gold)? What is the intercept? 3. A 300 nm radiation has phototon energy of 4.134 ev. Aluminum has a work function of 4.08 ev. What happens if we shine light of 300nm on an aluminum metal? Provide quantification of the KE. 4. Will photoelectrons be ejected if we shine 300nm on a metal that has a work function of 4.5 eV?