Question

Potassium and gold cathodes are used in a photoelectric-effect experiment. For each cathode, find: 1. The...

Potassium and gold cathodes are used in a photoelectric-effect experiment. For each cathode, find:

1. The threshold frequency
2. The threshold wavelength
3. The maximum electron ejection speed if the light has a wavelength of 210 nm
4. The stopping potential if the wavelength is 210 nm.

Throughout this problem, be sure to use 6.63 x 10^-34 J•s for Planck's constant.

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Answer #1

Work function of Potassium is 2.2 eV

and of Gold is 5.1 eV

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