Work Function, Kinetic Energy

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Jonathan Pai 2I
Posts: 90
Joined: Thu Sep 27, 2018 11:27 pm

Work Function, Kinetic Energy

Postby Jonathan Pai 2I » Tue Oct 09, 2018 1:59 pm

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.

Tam To 1B
Posts: 59
Joined: Thu Sep 27, 2018 11:25 pm

Re: Work Function, Kinetic Energy

Postby Tam To 1B » Tue Oct 09, 2018 4:40 pm

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!

405112316
Posts: 36
Joined: Thu Sep 27, 2018 11:17 pm

Re: Work Function, Kinetic Energy

Postby 405112316 » Sun Nov 04, 2018 9:47 pm

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.


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