Spectrum of Light from Hydrogen

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SUMMARY

The visible spectrum of light emitted by hydrogen consists of four specific wavelengths: 410 nm, 434 nm, 486 nm, and 656 nm. When observing a galaxy that is receding, these wavelengths shift due to the Doppler effect, altering their observed values. This phenomenon is crucial for determining redshift, as the ratio of observed to emitted wavelengths remains consistent across all wavelengths. Detailed information on this process can be found at the provided UCLA resource.

PREREQUISITES
  • Understanding of the Doppler effect in astrophysics
  • Familiarity with the concept of redshift
  • Basic knowledge of electromagnetic spectrum and wavelengths
  • Experience with astronomical observation techniques
NEXT STEPS
  • Research the mathematical formulation of redshift calculations
  • Explore the implications of redshift in cosmology
  • Learn about spectroscopy techniques used in astrophysics
  • Investigate the role of telescopes in observing distant galaxies
USEFUL FOR

Astronomers, astrophysics students, and anyone interested in the study of light spectra and cosmic phenomena will benefit from this discussion.

Philosophaie
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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?
 
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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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