Physical properties & threshold frequency

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Discussion Overview

The discussion revolves around the relationship between the physical properties of elemental metals, such as atomic size, and their threshold frequency, particularly in the context of the photoelectric effect and work function. Participants explore how these properties might influence the threshold frequency and the underlying quantum mechanical principles involved.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions the correlation between physical properties of metals and their threshold frequency, expressing uncertainty about their understanding.
  • Another participant suggests that the threshold frequency may relate to the work function, which is influenced by ionization energy and electron affinity, as well as charge shielding.
  • A later reply confirms the focus on work function and requests resources for understanding how physical properties affect it, indicating a need for further information.
  • One participant emphasizes the connection between ionization energy, electron affinity, and the work function, suggesting that these concepts are foundational to understanding the photoelectric effect.
  • Another participant argues that while there is a connection between physical properties and the work function, there is no straightforward relationship due to the complexity of quantum mechanical properties.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between physical properties and threshold frequency. Some suggest a connection through quantum mechanical properties, while others indicate that the relationship is not simple or direct. The discussion remains unresolved regarding the nature of this relationship.

Contextual Notes

Participants reference concepts such as ionization energy, electron affinity, and charge shielding without fully resolving how these relate to threshold frequency. There is an acknowledgment of the complexity of quantum mechanical properties influencing these discussions.

SmileyMan
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What effects do the physical properties (size of atom etc.) of an elemental metal have on the threshold frequency for that metal? I haven't been able to find a correlation between a physical property and the size of the threshold frequency myself; maybe I haven't looked hard enough, or maybe I've misunderstood something.
 
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By "threshold frequency" do you mean "work function" as in photoelectric effect? In that case, it's the ionization energy/electron affinity/all that stuff based on the "physical property" of charge shielding etc.
 
Einstein Mcfly said:
By "threshold frequency" do you mean "work function" as in photoelectric effect? In that case, it's the ionization energy/electron affinity/all that stuff based on the "physical property" of charge shielding etc.

Thank you for answering. Yes, that is what I mean. Do you know where I can find an article describing how those properties affect the work function? I am finishing a project on quantum mechanics, and this is the only part I need.
 
Well, like I said, it's got a lot to do with the ionization energy and/or electron affinity of the metal. If you think about what you learned in your chemistry classes, ionization energy is the amount of energy needed to remove an electron from the highest occupied orbital. In the photoelectric effect experiment, you're striking a metal with a photon (of a certain energy) and removing its electron. So, if you look up these three things (I'd say start with wikipedia) it should start to make sense.
http://en.wikipedia.org/wiki/Work_function
http://en.wikipedia.org/wiki/Electron_affinity
http://en.wikipedia.org/wiki/Ionization_energy
 
This is a backwards question.
The physical properties of the material are due to the bonding properties and so forth of the constituent atoms, which in turn is a quantum-mechanical property. The work function is also a quantum mechanical property and related to the bonding etc, but apart from that observation there's no simple relationship between these things.
 
Okay. Thank you both for answering. You have given me something to think about.
 

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