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| Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
|---|---|---|---|---|---|---|
| 22.9 | Expansion of the Universe |
1. The detected wavelength of one of spectral lines produced by radiation of hydrogen atoms in a remote galaxy is 453.2 nm. When the wavelength of the same spectral line is measured in lab conditions, it results as 434.1 nm. Calculate the receding speed of the galaxy from which the detected EM radiation originates.
Correct Answer: D
2. At what distance from Earth (in light years) is a galaxy that is receding at 2/5 of the speed of light?
Correct Answer: C
3. What is the age of Universe (in years) if it is considered as stable?
Correct Answer: B
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