The Quantum World

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Mohamed Mido
Posts: 127
Joined: Wed Sep 30, 2020 9:33 pm

The Quantum World

Postby Mohamed Mido » Sun Oct 18, 2020 7:28 pm

If the energy of the photon is exactly the same as the energy needed to remove the electron, does the electron never leave the surface of the metal because there is no excess energy and therefore no kinetic energy?

Summer_Corona 3L
Posts: 94
Joined: Wed Sep 30, 2020 10:06 pm
Been upvoted: 2 times

Re: The Quantum World

Postby Summer_Corona 3L » Sun Oct 18, 2020 7:36 pm

I believe the electron can still be ejected. I have in my notes from lecture that as long as the energy of the photon is greater than or equal to the work function, then the electron will be emitted.

Lauren Sarigumba 1K
Posts: 92
Joined: Wed Sep 30, 2020 9:41 pm

Re: The Quantum World

Postby Lauren Sarigumba 1K » Sun Oct 18, 2020 8:05 pm

The electron still gets emitted if the energy of the light matches the energy of the work function. The kinetic energy would just be zero.

Lillian
Posts: 69
Joined: Wed Sep 30, 2020 9:48 pm

Re: The Quantum World

Postby Lillian » Sun Oct 18, 2020 9:23 pm

I think maybe the electron wouldn't really move from the surface, but it would still be physically separated from the other atoms/electrons (it wouldn't be bound). Then again, that's a pretty rare scenario, for the energy of the photon to match the threshold energy exactly haha :DD

Danielle Goldwirth 3F
Posts: 62
Joined: Wed Sep 30, 2020 10:07 pm

Re: The Quantum World

Postby Danielle Goldwirth 3F » Sun Oct 18, 2020 9:28 pm

That's a good question and I believe the answer is revealed in your question: you say that the energy of the photon would be exactly the same as the energy needed to remove the electron, so wouldn't this imply that the electron is ejected because it received the EXACT amount NEEDED to REMOVE it from the surface. Based on this logic, I would assume that the electron is ejected, but I am not completely sure.

Bella Bursulaya 3G
Posts: 139
Joined: Wed Sep 30, 2020 9:54 pm

Re: The Quantum World

Postby Bella Bursulaya 3G » Sun Oct 18, 2020 9:31 pm

I believe in an experiment, there is a machine that has a positive charge that will attract that electron to it. However, in real life, if the electron doesn't have any excess kinetic energy, it would be removed from the atom temporarily and then reabsorbed as it is pulled by the positive charge of the nucleus.

Jaden Kwon 3C
Posts: 89
Joined: Wed Sep 30, 2020 9:49 pm

Re: The Quantum World

Postby Jaden Kwon 3C » Sun Oct 18, 2020 10:21 pm

Does anyone know how an electron can be emitted with 0 kinetic energy? Does it just stay in place or is it something else.

Joanna Huang
Posts: 92
Joined: Wed Sep 30, 2020 9:40 pm

Re: The Quantum World

Postby Joanna Huang » Sun Oct 18, 2020 10:54 pm

According to my notes, the electron can still be ejected from the surface of the metal if the photon energy is equal to the energy needed to eject the electron from the metal.


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