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An experimental is conducted to investigate the photoelectric effect with a Barium plate. When the wavelength...

An experimental is conducted to investigate the photoelectric effect with a Barium plate. When the wavelength of the incident light is less than 500.0 nm the plate starts emitting electrons.
a) what is the threshold frequency of the Barium plate?
b) what is the work function of Barium?
The wavelength of the incident light is charged to 300.0 nm.
c) what is the kinetic energy of the photoelectrons?

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