Results of Photoelectric experiments

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donnanguyen1d
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Joined: Fri Sep 29, 2017 7:04 am

Results of Photoelectric experiments

Postby donnanguyen1d » Mon Oct 09, 2017 5:46 pm

To interpret the results of photoelectric experiments the model of light needs to change from a ________ model to a ________ model. What are the two missing words? would this be from a particle model to a wave model?

Johann Park 2B
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Re: Results of Photoelectric experiments

Postby Johann Park 2B » Mon Oct 09, 2017 5:59 pm

I believe that it would be from the wave model to the particle model. The textbook notes that the results of some experiments (Photoelectric effect) compelled scientists to view that electromagnetic radiation is particlelike.

Sue Xu 2K
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Joined: Fri Sep 29, 2017 7:06 am

Re: Results of Photoelectric experiments

Postby Sue Xu 2K » Mon Oct 09, 2017 6:03 pm

I think it would be from the wave mode to the photon or particle mode. Not sure which word is correct.
Basically the experimental observations of photoelectric experiments is that no electrons are ejected unless the radiation has a frequency above a certain threshold value that is characteristic of the metal. To interpret that we have to propose that electromagnetic radiation consists of photons, and the energy of a single photon is related to the frequency of the radiation (Eq).

Chem_Mod
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Re: Results of Photoelectric experiments

Postby Chem_Mod » Mon Oct 09, 2017 6:04 pm

Hi Donna,

What's fascinating about the photoelectric effect is that Einstein's experimental results could only be explained from a particle model of light. This puts things into perspective when you truly understand what his experiment was: essentially photons of light colliding with, exciting, and ejecting electrons from a metal surface). Many other known experiments at the time could only be explained in terms of light acting as a wave.

Hope this helps!


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