Photons

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Kimberly Bauer 4E
Posts: 51
Joined: Thu Jul 25, 2019 12:17 am

Photons

Postby Kimberly Bauer 4E » Sun Oct 13, 2019 10:15 pm

Can a photon ever NOT have enough energy to eject one e-, and if so what happens?

Brandon Tao 1K
Posts: 100
Joined: Sat Aug 17, 2019 12:15 am

Re: Photons

Postby Brandon Tao 1K » Sun Oct 13, 2019 10:21 pm

Yes, it is possible for a photon to not have enough energy. If it does not then it won't be able to eject an electron. Like in lecture on Week 2, a photon packet overall does not need to have intense energy, but each photon itself must have enough intensity.

Shimei_2F
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am

Re: Photons

Postby Shimei_2F » Sun Oct 13, 2019 10:23 pm

If a photon has less energy than the work function, it would not be able to eject electrons.

Maya Pakulski 1D
Posts: 105
Joined: Thu Jul 11, 2019 12:17 am

Re: Photons

Postby Maya Pakulski 1D » Mon Oct 14, 2019 9:13 am

Yes, even if the photon has some energy, but not enough to get the electron the the next energy level, then the electron will not be ejected as it cannot go halfway between energy levels.

Joanne Lee 1J
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: Photons

Postby Joanne Lee 1J » Tue Oct 15, 2019 6:05 pm

Yes, there can be cases where the photons do not have enough energy to eject an electron. If there is not enough energy, then the electron will stay in whatever orbital it is currently in and will not jump to the other orbitals.

Jorge Ramirez_4H
Posts: 54
Joined: Wed Nov 21, 2018 12:19 am

Re: Photons

Postby Jorge Ramirez_4H » Tue Oct 15, 2019 6:32 pm

How do photons affect an electron's momentum and position?

Chetas Holagunda 3H
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Joined: Thu Jul 11, 2019 12:17 am
Been upvoted: 1 time

Re: Photons

Postby Chetas Holagunda 3H » Wed Oct 16, 2019 11:30 am

In response to Jorge's question, if a photon has enough energy within it, it can interact with an electron which is on its path and then displace its position. It can affect its velocity because if the electron is put on a different trajectory, its distance it travels is changed, causing the velocity to change since velocity is a vector for distance/time.

Katie Bart 1I
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

Re: Photons

Postby Katie Bart 1I » Wed Oct 16, 2019 11:34 am

And when velocity changes, so does momentum since velocity is a component of momentum.

Brandon Tao 1K
Posts: 100
Joined: Sat Aug 17, 2019 12:15 am

Re: Photons

Postby Brandon Tao 1K » Sun Oct 20, 2019 9:34 pm

If a photon doesn't have enough energy(work function) to eject a photon then nothing will happen. The photon's energy will simply be absorbed by the electron but with no results or consequences.

Jillian C 4C
Posts: 51
Joined: Sat Jul 20, 2019 12:16 am

Re: Photons

Postby Jillian C 4C » Sun Oct 20, 2019 10:48 pm

If a photon does not have enough energy to eject an electron, the electron stays in the same energy level.


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