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equation for the photoelectric effect

Posted: Mon Apr 23, 2018 10:02 pm
by Zuri Smith 1A
In class, I remember Dr. Lavelle describing the equation for the Photoelectric Effect as being:
E(photon) = hv = Work - 1/2mv^2. However, as I am trying to complete some of the problems in the book, the equation that is often used says "Work PLUS KE", rather than "Work MINUS KE". Did I write this down wrong in class or am I forgetting something?

Re: equation for the photoelectric effect

Posted: Mon Apr 23, 2018 10:11 pm
by annie_finneran_1K
work plus KE is what you use to figure out the energy of the photon if you are given work function and velocity of the electron that was ejected.


photon energy minus KE is what you use to figure out work function/minimum light needed to eject an electron. hope that helps!