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Unformatted text preview: U = energy density U A2 For mechanical waves An historical experiment measured KE of electrons emitted from Na metal due to light. The lights intensity and frequency was varied (Einsteins Photoelectric Effect experiment). A relationship existed between the energy of the electrons and the frequency of the light, but there was no relationship between the intensity of the light and the energy of the electrons. There is a minimum frequency below which no electrons will be emitted, regardless of intensity. v = frequency = wavelength E v = = E hv hc T = period = = K 2 2K = = T 2 T 2 Increasing intensity increased the electric current in the detector (amount of electrons being detected), but it didnt change the energy of the emitted electrons. The minimum amount of energy needed to knock an electron off is called the work function....
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This note was uploaded on 09/12/2011 for the course MSE 2020 taught by Professor Alamgir during the Spring '09 term at Georgia Institute of Technology.
- Spring '09