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2 C 20661

Section B (Paragraph/Problem Type)

Answer at least five questions.

Each question carries 5 marks.

All questions can be attended.
Overall Ceiling 25.

Show that in the non-relativistic limit, Lorentz transformations reduces to Galilean transformations.
(a) Ifastar’s brightness is increased by 45,000 times, how much is the change in its magnitude ?

(b) Faint Brown dwarf stars have absolute magnitudes of around 17.5. How much fainter they
are compared to Sun ?

Mention the important features of Cepheid variables. Why are they used as distance indicators ?
Discuss the standard big-bang theory for the origin of the universe.

A particle is traveling through the Earth’s atmosphere at a speed of 0.6c. To an Earth-bound
observer, the distance it travels is 1.50 km. How far does the particle travel in the particle’s frame
of reference ?

Discuss the classification of galaxies.
What kinds of objects make up the dark matter ?
(5 x 5 = 25 marks)
Section C (Essay Type)

Answer any one question.
The question carries 11 marks.

Derive the law of addition of velocities using Lorentz transformation equations.
Explain the star formation and life cycle of stars.

(1 x 11 = 11 marks)

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