GCSE Physics (AQA)

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Red-Shift

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Space physics Red-shift

Red-Shift

7:15 The Origin of the Universe
Spec 4.8.2
Previous The Doppler Effect Next Explaining Red-Shift
  • Stars absorb specific wavelengths of light they emit.
  • Stars generate energy through nuclear reactions, emitting electromagnetic waves.
  • Wavelengths determine wave properties, such as visible light color.
  • Most waves are released into space, but some are absorbed by atoms in the star.
  • Missing wavelengths appear as gaps in a light spectrum.
  • A spectrum can be produced by refracting white light or analyzed with a computer.
  • Emission spectrum shows different colors from low wavelength violet to high wavelength red.
  • Black bars in the spectrum indicate missing wavelengths absorbed by atoms.
  • Astronomers use missing wavelength patterns to determine properties of distant stars.
  • Each atom has a unique absorption pattern, e.g., hydrogen absorbs specific wavelengths.
  • Emission spectra help identify elements in stars.
  • Stars similar to the sun produce similar emission spectra.
  • Emission spectrum patterns can shift towards the red end for distant stars, known as redshift.
  • Redshift indicates light from distant galaxies increases in wavelength.
  • The further the galaxy, the greater the redshift effect.
  • Patterns can also shift towards the blue end, known as blueshift, indicating decreased wavelengths.
  • Blueshift is less common and occurs in certain galaxies like Andromeda.
  • Understanding redshift and blueshift helps analyze light from distant stars and galaxies.

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