In a photoelectric effect experiment, a metal sample is illuminated by 10.0mW of

Question

In a photoelectric effect experiment, a metal sample is illuminated by 10.0mW of ultraviolet light of wavelength 240 mm. It is observed that 250,000 photo electrons are ejected from the metal each second, with kinetic energies from 0 to 2.20 eV.

1) What is the work function of this metal in eV?

2) What is the longest wavelength of light that can knock electrons out of this metal?

Please show work. I can't understand it if its not written out step by step.

Explanation / Answer

1.E = hlsmbda - w ==>w = 1.6eV 2.284mm find lambda such that E =0

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