Threshold energy

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

Threshold energy

Postby Katherine Chhen 3I » Wed Oct 09, 2019 12:26 pm

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
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Re: Threshold energy

Postby asannajust_1J » Wed Oct 09, 2019 12:44 pm

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

Postby EvanWang » Wed Oct 09, 2019 12:45 pm

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

Postby annikaying » Wed Oct 09, 2019 3:36 pm

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

Postby Katherine Chhen 3I » Sat Oct 12, 2019 2:43 pm

Thank you for the clarification!

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

Re: Threshold energy

Postby Arianna Perea 3H » Sat Oct 12, 2019 4:27 pm

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

Sydney Jacobs 1C
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Re: Threshold energy

Postby Sydney Jacobs 1C » Sat Oct 12, 2019 4:36 pm

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.


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