What is the kinetic energy of electron at room temperature?

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Discussion Overview

The discussion revolves around the kinetic energy of electrons in metals at room temperature, exploring the relationship to Fermi energy and the distribution of electron energies within metals. The scope includes theoretical considerations and estimates related to electron behavior in solid-state physics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants inquire about the relationship between kinetic energy and Fermi energy, seeking the exact equation form.
  • There is a clarification that the question pertains specifically to electrons in metals at room temperature, as opposed to other contexts like vacuum or atomic systems.
  • It is noted that electrons in a metal have a distribution of energies rather than a single value, with the Fermi energy serving as an estimate for the order of magnitude of electron energy.
  • At absolute zero, the highest energy is the Fermi energy, but at room temperature, some electrons may have energies slightly above this level.
  • Participants suggest starting with an estimate of 1/40 eV to gauge how much electron energies may exceed the Fermi level at room temperature.
  • There is a discussion about deriving the Fermi energy of electrons in metals, with references to the density of states equation and the number of electrons in the metal, while questioning if other methods exist.
  • One participant requests clarification on the original poster's understanding and specific needs regarding the equations and concepts involved.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and clarity regarding the original question, with some agreeing on the relevance of Fermi energy while others seek more detail on the inquiry. The discussion remains unresolved with multiple viewpoints on how to approach the topic.

Contextual Notes

There are limitations in the clarity of the original question, as well as assumptions about the participants' familiarity with the relevant equations and concepts. The discussion does not resolve the complexities involved in measuring or calculating Fermi energy.

td21
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is it related to fermi energy? what is the exact equation form?
 
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What electron? Do you mean electrons in metals? Electrons in vacuum, in atoms, in accelerators, etc.
You questions is way too vague.
 
sorry. I miss the word. It is electrons in metals at room temperature. Thank you very much.
 
The electrons in a metal have a distribution of energies. Not just a single value.
The Fermi energy is a good estimate of the order of magnitude of the energy of the electrons.

At zero K the highest energy is the Fermi energy.
At room temperature some electrons will have energies slightly higher than Fermi energy.
 
Try starting with 1/40 eV, and see what you get.
 
This will be an estimate of how "high" they will go over the Fermi level at room temperature.
Typical values of Fermi energies are of a few eV.
 
nasu said:
This will be an estimate of how "high" they will go over the Fermi level at room temperature.
Typical values of Fermi energies are of a few eV.

Thank you very much. But how to derive the fermi energy of electrons in metal? (to obtain the number of a few eV) Is the only way to do this by density of states equation and the number n in metal? Is there any other equation?
Thanks,
td21
 
Can you describe in more detail what are you after?
From the OP it was not clear what you know about it. If you know the equations, what is your problem? You don't like them? You want more a more complex treatment than in introductory solid state books? You want to know how can one measure the Fermi energy?
It's not fair to expect people to try to guess what is your question about.
 

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