Bell shape like of Planck's distribution

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Discussion Overview

The discussion centers around the characteristics and implications of Planck's distribution, particularly its bell shape and the concept of quantized energy. Participants explore the relationship between Planck's distribution and the Maxwell-Boltzmann distribution, as well as the historical context of Planck's postulate regarding energy quantization.

Discussion Character

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

Main Points Raised

  • One participant suggests that the bell shape of Planck's distribution indicates that most atoms possess a certain average kinetic energy (K.E.), leading to a peak in the distribution, while others have higher or lower K.E., resulting in decreased intensity at longer or shorter wavelengths.
  • Another participant states that Planck's distribution can be derived from the Boltzmann distribution by assuming energy is quantized.
  • A question is raised about the meaning of energy being quantized, prompting further clarification on Planck's postulate.
  • Several participants discuss Planck's postulate, noting that it states energy comes in discrete packets, represented by the equation E=nhv, where n is an integer, h is Planck's constant, and v is the frequency of the oscillator.
  • There is a debate about whether Planck assumed the particle nature of light, with some attributing this idea to Einstein instead.
  • Clarifications are made regarding the interpretation of n in the equation, with one participant asserting it is simply an integer and not the number of oscillators, which is determined by the Boltzmann distribution.

Areas of Agreement / Disagreement

Participants express differing views on the implications of Planck's postulate and the extent to which it addresses the particle nature of light. There is no consensus on these interpretations, and the discussion remains unresolved.

Contextual Notes

Some participants express uncertainty about the connections between Planck's distribution and other distributions, as well as the implications of quantization. The discussion reflects varying levels of understanding and assumptions about the concepts involved.

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As a high schooler, what I can deduce from Planck's distribution's bell shape is that the majority of the atoms of a body above 0k possesses a certain K.E which is the average K.E which leads to the presence of a peak point in the distribution. While the minority posses higher or lower K.E which leads to the decrease of intensity of radiation for longer or shorter wavelengths than that of the peak point. And as the temperature of the body increases the K.E energy possessed by the majority increases so the peak point moves to a higher frequency, I think the explanation is related to maxwell-Boltzmann distribution to a great extent. All of what I said is just my deductions, at school we are not given explanations for what we study, and we don't have enough knowledge about the topics to deduce the explanations on our own, I'm keen on understanding every point, so I hope anyone on the forum to correct what I mentioned about the bell shape and give me a good explanation, thanks in advance.
 
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Jilang said:
You get from the second to the first by assuming that the energy is quantised - i.e. Existing in little packets.
What is meant by energy is quantized ?
 
Planck's postulate was that the energy of oscillators comes in discrete packets given by:
E=nhv
Where n is an integer, h is Plancks constant and v is the frequency of the oscillator. By applying this to the classical distribution for states he arrived at the Planck distribution.
 
Jilang said:
Planck's postulate was that the energy of oscillators comes in discrete packets given by:
E=nhv
Where n is an integer, h is Plancks constant and v is the frequency of the oscillator. By applying this to the classical distribution for states he arrived at the Planck distribution.
You mean we mean that he assumed the Particle nature of light ?
 
He didn't quite go that far. Einstein is given credit for that.
 
Jilang said:
He didn't quite go that far. Einstein is given credit for that.
But at least he assumed that the light is quantized to photons.
 
Jilang said:
Planck's postulate was that the energy of oscillators comes in discrete packets given by:
E=nhv
Where n is an integer
N is number of oscillators ?
 
ElmorshedyDr said:
But at least he assumed that the light is quantized to photons.

No, I don't think he went that far. It was a mathematical trick that gave the right answer.
 
  • #10
ElmorshedyDr said:
N is number of oscillators ?

No, it is just an integer. The number of oscillators is given by the Boltzmann distribution.
 

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