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1.3 of Unit 1.
b) Express the distances of the stars Sirius A and Antares from the Earth in light years.
2. a) The zenith distance of a star at latitude 60° N is 25°. Calculate its declination.
b) Explain the horizon coordinate system with the help of a diagram.
c) The local time at Allahabad is 5 PM. Calculate the local time at New Delhi at that time.
3. a) Explain the nebular model of the solar system.
b) Show that the magnitude of the tidal force experienced on the Earth due to the Moon depends on the latitude.
4. a) The absolute visual magnitude of a star is 6.5 and for its temperature, the bolometric correction is − 0.3. Calculate the absolute bolometric magnitude and the luminosity of the star.
b) What is H-R diagram? Discuss the characteristic features of stars located in any two distinct regions of the H-R diagram.
c) Explain how fusion reactions are made possible in the stars.
(a)5.0 km above the earth`s surface and
(b)5.0 km below the earth`s surface.Radius of earth=6400km
and the value of g at the surface of the earth is 9.80 m/s^2