This forum topic is for students to self-organize study groups, etc.
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You don't have to use the combined equation -- you can do first E = h.v and then c = lambda.v (when using E=h.v remember to convert kJ to J and find the energy per atom, as the work function given is per mol). But if you're interested in using the combined equation, simply single out v in the second equation to obtain v = c/lambda, then plug that into E = h.v to obtain E = (h.c)/lambda.
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