CAIE IGCSE Physics 6.2.3.9 Hubble constant H0 as recession speed
Practise defining H0, rearranging H0 = v/d, and using galaxy speed and distance data with correct powers of ten and units.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- define H0 as recession speed divided by distance from Earth or the observer
- rearrange H0 = v/d to calculate v or d from galaxy data in m, km, or light-years
- use proportionality between v and d to compare recession speeds for different galaxies
6.2.3.9—Hubble constant H0 as recession speed 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 how the speeds of galaxies and their distances from the Earth are related.
(their) speeds are (directly) proportional to distances (from Earth) OR H0=v/d
B1
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