Photoelectric Effect Experiment

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Sarah Zhari 1D
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Joined: Sat Sep 14, 2019 12:16 am

Photoelectric Effect Experiment

Postby Sarah Zhari 1D » Thu Oct 10, 2019 12:15 pm

I am not entirely sure of how the experiment demonstrating the photoelectric effect works... How and why are electrons ejected when light of a certain frequency is directed towards a metal surface?

Parker Smith
Posts: 102
Joined: Thu Jul 25, 2019 12:15 am

Re: Photoelectric Effect Experiment

Postby Parker Smith » Thu Oct 10, 2019 12:30 pm

When the electron absorbs the incoming photon, it is given energy. The energy, allows the electron to move further from the positively charged nucleus, as the energy is converted into movement or kinetic energy. The metal has a certain threshold energy, which means the photons bombarding the metal must match or exceed the threshold energy in order to eject an electron. That is why when the intensity of low frequency light is increased, no electrons are emitted.

Posts: 112
Joined: Wed Sep 18, 2019 12:19 am

Re: Photoelectric Effect Experiment

Postby AlyshaP_2B » Thu Oct 10, 2019 12:48 pm

Because of the law of conservation of energy, the energy lost as the electron moves through different energy levels has to be emitted as a photon.

Michelle Le 1J
Posts: 50
Joined: Fri Aug 09, 2019 12:16 am

Re: Photoelectric Effect Experiment

Postby Michelle Le 1J » Thu Oct 10, 2019 2:19 pm

Think of the light hitting the metal surface as a bunch of photos with an energy that is determined by its frequency. If there's not enough energy (aka the work function), then no electrons would be emitted.

Justin Quan 4I
Posts: 104
Joined: Sat Sep 14, 2019 12:17 am

Re: Photoelectric Effect Experiment

Postby Justin Quan 4I » Thu Oct 10, 2019 2:27 pm

Is light transferring energy to the electrons through photons?

Bryce Barbee
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

Re: Photoelectric Effect Experiment

Postby Bryce Barbee » Thu Oct 10, 2019 2:32 pm

Yes, the light is transferring energy through photons in the photon model of the experiment. I do not completely understand what is happening in the wave model of the experiment though.

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