Question about Density of states

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Discussion Overview

The discussion revolves around the concept of density of states in the context of continuous energy levels, particularly how this concept relates to quantum mechanics and the transition from discrete to continuous energy states. Participants explore the implications of dealing with large numbers of particles and the approximation of energy levels.

Discussion Character

  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant questions how density of states can be defined in continuous energy, given that energy states originate from quantum mechanics, which typically deals with discrete energies.
  • Another participant suggests that in systems with many particles in large volumes, energy levels become closely spaced, allowing for the approximation of discrete energy levels as a continuum.
  • A further contribution reiterates that continuous energy levels arise from densely packed discrete energy levels, proposing that the concept of state persists even when imposing a continuous energy framework.
  • A request is made for a derivation demonstrating how energy levels approach a continuum as the number of particles increases within a fixed volume, noting familiarity with the concept of energy levels tending to a continuum as volume increases.
  • One participant challenges the assertion that quantum mechanics deals solely with discrete energies, arguing that the term "quantum mechanics" is historically misleading and suggesting alternative terminology.

Areas of Agreement / Disagreement

Participants express differing views on the nature of energy states in quantum mechanics and the validity of approximating discrete energy levels as continuous. The discussion remains unresolved regarding the definitions and implications of these concepts.

Contextual Notes

There are limitations in the assumptions made about the relationship between particle number, volume, and energy levels, as well as the definitions of quantum mechanics and its terminology. These aspects remain open for further exploration.

Who May Find This Useful

This discussion may be of interest to those studying quantum mechanics, statistical mechanics, or anyone exploring the implications of density of states in physical systems with large particle numbers.

Shan K
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How can we define density of state in continuous energy? As the term energy state comes from quantum mechanics which deals with discrete energies.
Thanks in advance
 
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If one us dealing with lots of particles in large volumes, the energy levels are usually close to each other compared to your experimental resolution, and it's usually ok to approximate the discrete energy levels by a continuum.
 
Last edited:
atyy said:
If one us dealing with lots of particles in large volumes, the energy levels are usually close to each other compared to your experimental resolution, and it's usually ok to approximate the discrete energy levels by a continuum.

So continuous energy level are the resultant of many highly packed discrete energy levels. So the concept of state remain there as the concept of continuous energy is been imposed by us for highly packed discrete energy level. Is this right?

Can you give me a derivation which can show that, the energy level tends to continuum as the number of particle increase for a fixed volume? As I know how the energy level tends to continuum as the volume increase.
 
Shan K said:
As the term energy state comes from quantum mechanics which deals with discrete energies.
This is actually not true that quantum mechanics deals only with discrete energies. "Quantum mechanics" is in fact a misnomer, used only for historical reasons. Perhaps a better name would be "wave mechanics" (which is rarely used), or even better "uncertainty mechanics" (which is not used at all).

If that confuses you, then you can see also
https://www.physicsforums.com/blog.php?b=3873
 
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