A certain metal has a work function of 3.90 eV; two different light sources shin

Question

A certain metal has a work function of 3.90 eV; two different light sources shine on the metal in separate experiments. Light A has wavelength 220nm and light B has a wavelength of 360nm.
a.Which light is able to eject electrons from the metal? Show calculation to support your answer.
b. In using the light source which is able to eject electrons, find the momentum of the ejected electrons (electron mass is 9.11x10^-31 kg).
c. Find the largest wavelength of light which will be able to eject electrons from the metal.

Explanation / Answer

a. Energy of light A = hc/220 = 5.64 eV > Workfuntion This can eject electrons Energy of light B = 3.47 eV

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