## Work Function

305385703
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

### Work Function

What is the difference between the work function and the threshold energy?

Anna Wu 1H
Posts: 51
Joined: Sat Aug 17, 2019 12:16 am

### Re: Work Function

The work function refers to the energy needed, while the threshold energy refers to the frequency of light needed. The two are the same in calculations.

Brian_Ho_2B
Posts: 221
Joined: Fri Aug 09, 2019 12:16 am

### Re: Work Function

The two terms are synonymous in calculations and they both refer to the (phi) in the equation:
hv - phi (work function/threshold energy) = kinetic energy of emitted electron

Esha Chawla 2E
Posts: 108
Joined: Thu Jul 25, 2019 12:17 am

### Re: Work Function

305385703 wrote:What is the difference between the work function and the threshold energy?

From my understanding, the work function relates the photon's total energy, the required amount of threshold energy, and the kinetic energy. Essentially, it states that some of the photon's total energy is first used up to meet the threshold energy. Whatever is left over from that is energy that is put toward's the electron's kinetic energy. Thus, the sum of the electron's kinetic energy and the threshold energy equal to the photon's total energy.

DMuth_1J
Posts: 63
Joined: Thu Jul 11, 2019 12:15 am

### Re: Work Function

I like to look at it according to the words "work" and "threshold." The work of the function is what is being done, or the action. The threshold is the point that must be reached. They are often synonymous because once the threshold energy is met the work function is performing.