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March 1, 2015

Homework Help: AP Chemistry

Posted by qwerty123 on Wednesday, November 17, 2010 at 5:35pm.

To eject electrons from the surface of potassium metal, 222kJ/mol of electrons are needed.
a) What minimum frequency of light is needed to supply the required energy?
b) What is the wavelength of this light?
c) If potassium is irradiated with light having wavelength of 350 nm, what is the maximum E(sub K) of an emitted electron?
d) What maximum speed in m/2 will the electrons in part (c) have?

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