C 20661 (Pages : 2) ಸ ರ ರರ ௧௨2௨ 2௧

SIXTH SEMESTER U.G. DEGREE EXAMINATION, MARCH 2022
(CBCSS—UG)
Physics/Applied Physics
PHY 6B 13/APH 6B 13—RELATIVISTIC MECHANICS AND ASTROPHYSICS
(2019 Admissions)
Time : Two Hours Maximum : 60 Marks
The symbols used in question paper have their usual meanings.
Section A

Answer at least eight questions.
Each question carries 3 marks.
All questions can be attended.

Overall Ceiling 24.

1. What is meant by transformation equations in relativity ?
2. Why did Einstein assume that the speed of light in vacuum is a universal constant ?
3. State the Cosmological principle.
4. Is the white dwarf a stable equilibrium state ? Explain why.
5. Give the postulates of special relativity.
6. Define luminosity of a star. Is the luminosity of a star related to its temperature ?
7. Sirius has a parallax of 0.379 arcseconds. How much parsec is its distance from the Earth ?
8. What is CMBR?
9. Explain Hubble’s law for the expansion of the universe.
10. Explore the features of AGN. Why are they called so ?
11. Whatare Binary stars ?
12. Mention the features of Population II stars ?

(8 x 3 = 24 marks)

Turn over

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