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Work Function

Posted: Sun Oct 20, 2019 3:33 am
by Nikita Patra 3J
What is the difference between the work function and the threshold frequency?

Re: Work Function

Posted: Sun Oct 20, 2019 4:09 am
by Indy Bui 1l
Threshold frequency refers to the minimum possible frequency of light needed to eject an electron from a metal's surface. Work function refers to the minimum energy level needed to eject an electron from a metal's surface. Thats the main difference; threshold frequency refers to the minimum frequency of light and work function refers to the energy required to emit electrons.

Work function is noted using the greek letter phi Φ

Re: Work Function

Posted: Sun Oct 20, 2019 12:23 pm
by Reagan Smith 1H
If you are talking about work function and threshold energy rather than threshold frequency, they are virtually the same thing, nearly interchangeable. Threshold energy is the minimum amount of energy needed to eject an electron from a metal surface, and that is denoted by the work function.

Re: Work Function

Posted: Sun Oct 20, 2019 12:58 pm
by Amy Xiao 1I
Dr. Lavelle uses those terms practically interchangeably when discussing the photoelectric effect.

Re: Work Function

Posted: Sun Oct 20, 2019 3:37 pm
by DesireBrown1J
What are some practice problems from the book that require us to use the work function equation hv-Φ=1/2mv2?

Re: Work Function

Posted: Sun Oct 20, 2019 10:30 pm
by quresh3E
If the total energy of the photon was equal to the work function, and the kinetic energy was zero, then is the electron ejected? How can the electron be ejected if there is no kinetic energy?

Re: Work Function

Posted: Sun Oct 20, 2019 11:42 pm
by jmtz1I
I've noticed that Lavelle uses those two terms interchangeably as well. But in my plf session, they described work function as the energy needed to remove an electron from a solid surface.

Re: Work Function

Posted: Tue Oct 22, 2019 3:09 pm
by Adelpha Chan 1B
Nikita Patra 3J wrote:What is the difference between the work function and the threshold frequency?


The two terms are used interchangeably by Professor Lavelle during the lecture. They both refer to the amount of energy required, or threshold, to remove electrons from the surface of a solid metal.

Re: Work Function

Posted: Thu Oct 31, 2019 9:58 am
by 505106414
Is work function, Φ used in any other equations besides the KE/Energy of a photon one?

Re: Work Function

Posted: Fri Nov 01, 2019 11:15 pm
by alicechien_4F
We have only used the work function in the context of the photoelectric effect, so if you see it you can assume you will be using the Energy/KE equation. Hope this helps!