Question: Potassium and gold cathodes are used in a photoelectric effect experiment. For each cathode, find: a. The threshold frequency. b. The threshold wavelength. c. The

Potassium and gold cathodes are used in a photoelectric effect experiment. For each cathode, find:
a. The threshold frequency.
b. The threshold wavelength.
c. The maximum photoelectron ejection speed if the light has a wavelength of 220 nm.
d. The stopping potential if the wavelength is 220 nm.

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