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

[cloud_sync]

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.

 

[berkeman]

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?

 

[Chronos]

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.

 

[cloud_sync]

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?

 

[russ_watters]

What kind of wave are you asking about?

 

[cloud_sync]

Electromagnetic. What wavelengths are you guys regarding?

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

 

[berkeman]

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.

 

[cloud_sync]

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?"