## Threshold energy

Katherine Chhen 3I
Posts: 53
Joined: Fri Sep 28, 2018 12:15 am

### Threshold energy

Is the threshold energy a set number or would the threshold energy vary depending on the problem?

asannajust_1J
Posts: 105
Joined: Wed Sep 11, 2019 12:16 am
Been upvoted: 1 time

### Re: Threshold energy

Threshold energy depends on the problem. Remember, for an electron to be emitted, a specific wavelength and energy must be reached. This is unique to every situation.

EvanWang
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

### Re: Threshold energy

Different elements have different threshold energies. If it's not given, you can always determine the threshold energy by using
Threshold energy=Energy of photon-kinetic energy of ejected electron

annikaying
Posts: 94
Joined: Sat Sep 14, 2019 12:16 am

### Re: Threshold energy

The threshold energy depends on the type of element as different elements have different properties.

Katherine Chhen 3I
Posts: 53
Joined: Fri Sep 28, 2018 12:15 am

### Re: Threshold energy

Thank you for the clarification!

Arianna Perea 3H
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

### Re: Threshold energy

In other words the working function given in problems is the threshold energy?

Sydney Jacobs 1C
Posts: 59
Joined: Thu Jul 25, 2019 12:15 am
Been upvoted: 1 time

### Re: Threshold energy

Yes, the work function and threshold energy both refer to the energy required to eject an electron from a metal surface. When looking at the equation E(photon)-E(required to remove electron)=E(excess), the energy required to remove the electron refers to the "work" that must be put in to allow this to happen.