Question: The work function of potassium is 3.68 10-19 J. (a) What is the minimum frequency of light needed to eject electrons from the metal?

The work function of potassium is 3.68 × 10-19 J.
(a) What is the minimum frequency of light needed to eject electrons from the metal?
(b) Calculate the kinetic energy of the ejected electrons when light of frequency equal to 8.62 × 1014 s-1 is used for irradiation.

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