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Astronomical Measurements and Observations Practice Questions
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| Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
|---|---|---|---|---|---|---|
| 22.7 | Astronomical Measurements and Observations |
Astronomical Measurements and Observations Revision Questions
1. The parallax of Alpha Centauri - one of the closest stars to Earth is 0.75". How many light years is it from Earth?
- 4.35
- 3.26
- 1.33
- 0.75
Correct Answer: A
2. The absolute magnitude vs period of rotation graph of Cepheid stars is shown in the graph below.
A Cepheid has a period of change in illumination equal to 10 days when viewed from Earth and an average apparent magnitude equal to 5. What is the distance (in parsecs) of this Cepheid from Earth (to the closest integer)?
- 28
- 280
- 631
- 2057
Correct Answer: C
3. How big is the visible Universe in light years? Assume the visible universe as a sphere with Earth located at centre of this sphere.
- 6 000 000
- 3 000 000 000
- 6 000 000 000
- 19 560 000 000
Correct Answer: D
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- Continuing learning cosmology - read our next physics tutorial: Orientation in the Sky and Constellations
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