Incident light. Cathode. Anode. A. V. +. -. Stopping potential:. V o = 0.800 V. Example 4: The threshold frequency for a given surface is 1.09 x 10 15 Hz . What is the stopping potential for incident light whose photon energy is 8.48 x 10 -19 J ? . Photoelectric Equation:.
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Vo= 0.800 V
Example 4:The threshold frequency for a given surface is 1.09 x 1015 Hz. What is the stopping potential for incident light whose photon energy is 8.48 x 10-19 J?
W = (6.63 x 10-34 Js)(1.09 x 1015 Hz) =7.20 x 10-19 J
90 eVExample 5:What is the de Broglie wavelength of a 90-eV electron? (me = 9.1 x 10-31 kg.)
Next, we find momentum from the kinetic energy:
p = 5.12x 10-24 kg m/s
l = 0.122 nm