Discreet Quanta versus the Continuous Electromagnetic Spectrum

Click For Summary

Discussion Overview

The discussion centers on the relationship between discrete quanta of photon energy and the continuous electromagnetic spectrum, exploring concepts such as quantization, wave-particle duality, and the nature of photons in different contexts. Participants examine whether the continuous appearance of the spectrum arises from overlapping quanta, temperature dependencies, or finely divided energy levels.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants question how discrete photon energies can form a continuous spectrum and suggest exploring the roles of overlap, temperature, and energy level divisions.
  • One participant asserts that photons should not be classified strictly as waves or particles, emphasizing that their behavior depends on the measurement context.
  • Another participant points out that while photons are quantized, they can exist at any frequency, with specific energy values associated with particular wavelengths.
  • It is noted that electrons in atoms have quantized energy levels due to confinement, while free photons in space do not exhibit such quantization.
  • A participant expresses confusion about measuring free photons, questioning the implications of wave function collapse on their detectability.

Areas of Agreement / Disagreement

Participants express differing views on the nature of photons and the implications of quantization, indicating that multiple competing perspectives remain without consensus on the underlying principles.

Contextual Notes

Limitations include potential misunderstandings of wave-particle duality, the implications of Planck's constant, and the conditions under which photon energies are considered quantized or continuous.

Mcellucci
Messages
8
Reaction score
0
How can discreet quanta of photon energy make up a continuous electromagnetic spectrum, whose wavelengths are any arbitrary value? Is there overlap of quanta, temperature dependency, or so many finely divided energy levels that the spectrum just appears continuous? Electron energies are quantized as are the photons emitted, but wavelengths are any length whatsoever. Are there any wavelengths that have never been "seen"?
What am i missing?
 
Physics news on Phys.org
Mcellucci said:
How can discreet quanta of photon energy make up a continuous electromagnetic spectrum, whose wavelengths are any arbitrary value? Is there overlap of quanta, temperature dependency, or so many finely divided energy levels that the spectrum just appears continuous? Electron energies are quantized as are the photons emitted, but wavelengths are any length whatsoever. Are there any wavelengths that have never been "seen"?
What am i missing?

I think what you are missing is that photons are not waves and they are not particles, they are quantum objects. If you measure wave behavior, you GET wave behavior (with no quantization). If you measure particle behavior, you GET particle behavior (with quantization). Thinking of quantum objects as classical objects leads to this kind of confusion.
 
Yet, isn't Planck's constant a quantum function which relates energy to wavelength?
 
* Photons are quantized in that they come in discrete units, but you can have a photon with any frequency. It's just that 500 nm light, say, always comes in packets (photons) with energy 6.23e-20 Joules.

* In general, the allowed energy levels of a particle get quantized if you confine the particle to a finite region. Electrons in atoms are bound by the electric field of a nucleus to orbit within a small region around the nucleus, and so the electrons only have a discrete set of allowed energy level. Photons propagate freely through space, and so their allowed energy levels are not quantized. Free electrons, which are not currently part of any atom, can also have any energy. Conversely, If you build a closed box with mirrors on the inside to contain photons, the photons you trap will only be able to occupy a discrete set of energy levels. (The spacing between the energy levels gets smaller as you increase the size of the box, so this goes over smoothly to the free space situation as you increase the size of the box.)
 
Oh, I get it, now. The wavelength can be changed arbitrarily but the energy in it is in constant inverse porportion to it. And free photons are not quantized in free space. Hmm...but how would you know that? Free photons can't be measured, can they? Only after their wave function collapses? No?
 
Last edited:

Similar threads

  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 23 ·
Replies
23
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 13 ·
Replies
13
Views
5K