Threshold Energy

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Yazmin Bocanegra 3L
Posts: 51
Joined: Thu Jul 25, 2019 12:17 am

Threshold Energy

Postby Yazmin Bocanegra 3L » Thu Oct 31, 2019 7:58 pm

What is the definition of threshold energy and how do we find it?

Brooke Yasuda 2J
Posts: 102
Joined: Sat Jul 20, 2019 12:17 am

Re: Threshold Energy

Postby Brooke Yasuda 2J » Thu Oct 31, 2019 8:25 pm

threshold energy is also called the work function. Remember in the photoelectric effect experiment, the incoming energy of electromagnetic radiation needed to reach a certain threshold energy, or threshold frequency, to be able to eject an electron. You can calculate this with the equation that states Threshold Energy = Energy of the incoming photon - KE.

Alexa Mugol 3I
Posts: 54
Joined: Sat Aug 17, 2019 12:17 am

Re: Threshold Energy

Postby Alexa Mugol 3I » Fri Nov 01, 2019 11:38 am

Threshold energy is the minimum amount of energy to eject an e- (from the photoelectric effect). If the incoming light has more than the threshold energy, the remaining energy is emitted as kinetic energy. Therefore, E(incoming light) = threshold energy + kinetic energy. Usually, the work function is given to you, but if it isn't you can solve for it by substituting kinetic energy as 0 (since no kinetic energy would be given off).

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