What is the process for deriving a galaxy's (i.e. Milky Way) wavelength?

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Discussion Overview

The discussion revolves around the process of deriving a wavelength associated with the Milky Way galaxy. Participants explore various interpretations of "wavelength," including its relation to size, resonant frequencies, and electromagnetic radiation. The conversation includes attempts to apply different formulas and concepts, such as Compton's formula and de Broglie wavelength, while participants express uncertainty about the appropriate definitions and calculations involved.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant attempts to calculate a wavelength using Compton's formula but finds the result to be "substantially off scale" and seeks clarification on deriving a galaxy's wavelength.
  • Another participant questions the meaning of "wavelength," suggesting it could refer to size or resonant frequencies, indicating a need for clarification on the term.
  • A different participant asserts that the Milky Way does not have a singular 'wavelength' as its radiation spans the electromagnetic spectrum, contrasting it with the concept of wavelengths associated with the Big Bang.
  • One participant mentions the mass of the Milky Way and inquires about deriving a wavelength from its physical dimensions, suggesting a connection between mass and wavelength.
  • Several participants ask for clarification on what type of wave is being discussed, with a focus on electromagnetic waves.
  • Concerns are raised about the chart in the original post, with one participant suggesting it shows relative sizes rather than wavelengths, prompting further discussion on the definitions involved.
  • Another participant questions whether the diameter and thickness of the Milky Way could represent its wavelength, highlighting confusion over the concept of wavelength measurement.

Areas of Agreement / Disagreement

Participants express differing views on the concept of "wavelength" in relation to the Milky Way, with no consensus reached on how to define or calculate it. Multiple interpretations and competing ideas remain unresolved.

Contextual Notes

Participants express uncertainty about the definitions of wavelength and how it applies to a galaxy, indicating potential limitations in their understanding of the concepts involved. The discussion reflects a variety of assumptions about the relationship between mass, size, and wavelength.

cloud_sync
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I am creating this wavelength chart (attached).

I was told to use Compton's formula; I got this:
(6.626068 × (10^(-34))) / (1.1542e+42 * 299 792 458) = 1.91493535 × 10-84

Apparently, it is substantially off scale. I was then told to try de Broglie wave. Wikipedia only shows relations. I am learning the ropes here; I would like to see the process in how to derive a galaxy's (i.e. Milky Way) wavelength.
 

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cloud_sync said:
I am creating this wavelength chart (attached).

I was told to use Compton's formula; I got this:
(6.626068 × (10^(-34))) / (1.1542e+42 * 299 792 458) = 1.91493535 × 10-84

Apparently, it is substantially off scale. I was then told to try de Broglie wave. Wikipedia only shows relations. I am learning the ropes here; I would like to see the process in how to derive a galaxy's (i.e. Milky Way) wavelength.

Welcome to the PF.

What do you mean by "wavelength"? Do you just mean size? Or are you asking about resonant frequencies or emitted radiation wavelength ranges?
 
The Milky Way does not have a 'wavelength'. It's radiation is spread across most of the EM spectrum. I believe you are thinking of the big bang - which does have a wavelength, so to speak - specifically accoustical wavelengths. This is a horse of a different color.
 
A galaxy = planets + gas + space debris = matter. Wikipedia had the Milky Way's mass so how would one derive the wavelength of a galaxy (attachment above) from a side view. Has this ever been calculated in science?
 
Electromagnetic. What wavelengths are you guys regarding?

http://en.wikipedia.org/wiki/Electromagnetic_spectrum"
 
Last edited by a moderator:
cloud_sync said:
Electromagnetic. What wavelengths are you guys regarding?

http://en.wikipedia.org/wiki/Electromagnetic_spectrum"

The chart in your original post (OP) appears to show the relative sizes (in meters) of objects, and has little to do with a "wavelength". You can look up the diameter of the Milky Way Galaxy, and fill that into the chart.
 
Last edited by a moderator:
http://en.wikipedia.org/wiki/Milky_Way"

This is disturbingly intriguing. Wiki states the diameter and the thickness, but that cannot be it, could it? Is not a electromagnetic, wavelength measurement from "crest to crest?"
 
Last edited by a moderator:

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