CAIE IGCSE Physics Galaxy Speed from Redshift
Practise identifying the measured increase in a galaxy's starlight wavelength, or redshift, as the observation used to determine recession speed.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- identify wavelength increase or redshift of a galaxy's starlight as the measurement used for recession speed
6.2.3.7—Speed v at which a galaxy is moving question 1
[Maximum number: 1]
The Milky Way is the galaxy in which the Solar System is located.
Astronomers determine the speed and distance from the Earth of a far galaxy that is moving away from the Earth.
State one observation that allows the speed at which a galaxy is moving away to be determined.
increase in wavelength (of light from far galaxy) OR (amount of) redshift
B1
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