Physics GCSE
absorption line spectra
What absorption line spectra means in Physics GCSE, as defined for AQA.
Definition of absorption line spectra
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Reference: AQA
Dark lines in a galaxy's spectrum, produced by known elements and appearing at known wavelengths in the laboratory, used to measure the size of the shift.
Topics that use absorption line spectra
- Red-shift (physics only) (AQA GCSE)
Related terms
- accelerating expansion
- dark energy
- dark mass and dark energy
- expanding universe
- increase in wavelength
- measuring distance
- receding galaxies
- red end of the spectrum
Using absorption line spectra in the exam
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