CAIE A-Level Physics 25.3.1 Shifted Spectral Lines
Practise identifying redshift by comparing observed and known spectral lines, then explaining how recession changes wavelength or frequency.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- A2
Exam points
- identify redshift by comparing observed spectral-line positions with known emission or absorption lines
- explain how recession changes observed wavelength or frequency
25.3.1—The lines in the emission and absorption spectra question 1
[Maximum number: 2]
The lines in Fig. 10.1 have been corrected for redshift.
Explain how cosmologists are able to determine that light from a distant star has undergone redshift.
by examining the (lines in the) spectrum (of light from the star)
B1
and comparing with known spectrum
B1
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