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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.