Spectrum of Light from Hydrogen

  • #1
461
0

Main Question or Discussion Point

The visible spectrum of light from hydrogen displays four wavelengths, 410 nm, 434 nm, 486 nm, and 656 nm normally.

Which changes when a telescope is pointed at a Galaxy that is moving away?
 

Answers and Replies

  • #2
UltrafastPED
Science Advisor
Gold Member
1,912
216
They all change; the same goes for the wavelengths which are not visible.

The process is detailed here: http://www.astro.ucla.edu/~wright/doppler.htm

Note that the ratio of observed over emitted wavelength is the same for all wavelengths; this is how we determine the red shift.
 

Related Threads on Spectrum of Light from Hydrogen

  • Last Post
Replies
1
Views
642
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
18
Views
6K
Replies
1
Views
1K
  • Last Post
Replies
1
Views
2K
Replies
3
Views
916
  • Last Post
Replies
16
Views
7K
  • Last Post
Replies
12
Views
7K
  • Last Post
Replies
10
Views
2K
Top