## Work Function and Threshold Energy [ENDORSED]

DanielaWong_2G
Posts: 20
Joined: Wed Sep 21, 2016 2:56 pm

### Work Function and Threshold Energy

Hi guys! So I'm a little unclear on whether the work function and the threshold energy are the same thing? I know the work function is the energy required to remove an electron but wouldn't it be the same number as the threshold energy?

Ashley Bertholf 1E
Posts: 10
Joined: Fri Jul 15, 2016 3:00 am

### Re: Work Function and Threshold Energy  [ENDORSED]

Hi Daniela!
To my understanding the work function is the minimum amount of energy needed to remove an electron from a metal surface, this means that every individual metal surface has its own specific and uniform work function. While on the other hand, the threshold energy is the specific frequency an incident light needs to reach to release electrons from a surface. Thus the minimum frequency the photons can have to produce an give off an electron is when the photon energy is equal to the work function. I hope this helped :)

The website below gives a few graphic examples that I think might help you!

http://physicsnet.co.uk/wp-content/uplo ... -graph.jpg

Jasmine Cha 1A
Posts: 22
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Work Function and Threshold Energy

Work function and threshold energy do have slight differences, but in the chem course reader Professor Lavelle used them interchangeably when describing an equation.

Janice Kim 3I
Posts: 33
Joined: Wed Sep 21, 2016 2:56 pm

### Re: Work Function and Threshold Energy

The work function and the threshold energy both refer to the energy required to eject an electron from the metal surface. In the formula, E(photon)=E(energy remove electron) = E(excess), the E(energy remove electron) is the amount of work that needs to be put in the system in order to eject the electron. Although the work function specifically refers to the energy that needs to be put in, and the threshold energy refers to the frequency required to eject an electron, they are the same thing when calculating with the equation.