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Work Function, Kinetic Energy

Posted: Tue Oct 09, 2018 2:59 pm
by Jonathan Pai 2I
How do you find Kinetic Energy when you are provided only the Work Function and Velocity values? Where would we get the mass, because isn't that necessary for .5mv^2? What other equations are used in this situation.

Re: Work Function, Kinetic Energy

Posted: Tue Oct 09, 2018 5:40 pm
by Tam To 1B
E(kinetic energy of e-) = .5mv^2.
The mass of the electron will usually be given to you.
The mass of an electron is about 9.11E-31 kg. Plug it in and you should get your answer!

Re: Work Function, Kinetic Energy

Posted: Sun Nov 04, 2018 9:47 pm
by 405112316
Energy of photon - work function = kinetic energy

If you just need to find the kinetic energy and you have the velocity, plug in the mass of the electron (given value) and solve Ek = (1/2)mv^2.