Spectrum of Light from Hydrogen

  • #1
Philosophaie
462
0
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
1,914
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.
 

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