Loading…
Loading…
GCSE Physics · key term
A line at a particular wavelength in a spectrum, produced or absorbed by a particular element.
Used by OCR
Paper 1, Paper 2
Revise: Red-shift and Evidence for the Big BangWhen light is separated into a spectrum, it can contain a recognisable pattern of spectral lines. Particular elements produce lines at particular wavelengths, so the pattern acts rather like a barcode.
For red-shift, link all three stages: the galaxy is receding, its observed wavelengths are longer, and its spectral lines shift towards the red end of the spectrum.
Create a free account to read GCSE Physics revision notes for your exam board and track your progress.