Introductory Astronomy — DU B.Sc. (Hons) Physics Previous Year Question Papers

SI. of Question Paper : Introductory Astrophysics Name of the Department : B.Sc. Hons. Physics_GE paper (NEP: UGCF-2022) VII- Semester (a) Discuss the Horizon coordina,te system to locate the position of a star with, the help of a relevant diagram. (b) What are the methods to determine the size of an astronomical objects? (c) Define apparent and absolute magnitudes of a stellar object. (d) What are the various features of stellar object which can be known through HR-diagram? (e) What is SETI@Home? Is the project still active? (I) What are the atmospheric layers of the Sun? How temperature varies in different layers?a (g) Write the full form and features of GMRT. Q2. (a) What are the stellar energy sources? Discuss the various methods to determine the temperature of as.tronomical obj ects. ." (b) How we can determine the distance of an astronomical object using para]lax method ? Discuss its limitations. (c) Derive the distance modulus relation for a star. Q3. (a) Define following with an appropriate diagram (i) Meridian, (ii) Celestial Sphere, (iii) Celestial equator, (iv) Vertical circle (10) (b) Discuss the Universal coordinate system to locate an object on celestial sphere. Discuss its advantages? (8) Q4. (a) Define Resolving power and Limiting magnitude. Derive the relation of limiting magnitude of a telescope with primary diameter D with respect to eye. (10) (b) Discuss the purpose and features of any two of the following (8) (i) James Web telescope (ii) Aladin sky atlas (iii) Fermi Gamma ray space telescope Q5. (a) Define tidal force and derive the relation (b) What are exoplanets? What are the characteristic and various methods to detect exoplanets? (8) (c) Discuss key features of the Indian astronomy mission Aditya and the instruments it carries. (8) Some important physical constants: Mass of Sun Mo=2 × 10 kg Radius of Sun RO=7x10°m Temperature of Sun To = 5800K Luminosity of Sun 40=4×1026W Solar Constant S= 1400m/m? Boltzmann Constant KB = 1.38 × 10-23J/K Gravitational Constant G= 6.6 × 10-11 Nm Kg 2 Hubble Constant Ho= 70 Km/s/Mpc One Astronomical Unit 1AU = 1.5 × 1011m One Light year 1Ly = 9.46 × 1015m One parsec 1pc =3×1016m