Exam Details
| Subject | Astronomy and Astrophysics | |
| Paper | ||
| Exam / Course | Bachelor Degree Programme (Elective Course: Physics) | |
| Department | School of Sciences (SOS) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
1. Attempt any five parts
A main sequence star has mass 10 x Mo. Compute the luminosity of the star in terms
of Lo.
On the Celestial sphere, show the path of circumpolar stars for an observer at latitude 0.
Explain why the temperature of chromosphere increases with height.
What are active galaxies any two active galaxies.
What would the surface magnetic field be when the Sun shrinks to the size of a neutron star with radius 11 km (Take surface magnetic field of the Sun
What is interstellar reddening What causes it?
Give two arguments In support of an expanding universe.
Locate the position of stars of spectral class B on the H-R diagram.
2. With proper sketches, explain the horizon coordinate system used for locating a celestial object. Why is it convenient to locate a celestial object with a small telescope using this system What are its shortcomings?
OR
State and prove the virial theorem for a planet going around the Sun in a circular orbit. Using the vinal theorem, estimate the number of stars in a cluster of radius 1018 m with random velocities of the order of 10^4 ms^-1. (Take the average mass of star to be equal to 10^30 kg)
3. Discuss the nebular model for the formation of the solar system. How does the nebular model explain the inconsistency in the distribution of angular momentum in the solar system?
OR
What are sunspots? Why is the temperature of sunspots lower than their surroundings Explain. Sketch the Butterfly diagram and explain its significance.
4. What are neutron stars How were they detected Calculate the gravitational red-shift for the light of wavelength 600 nm after travelling 1 m on the surface of a neutron star having mass equal to mass of the Sun and radius 15 km.
OR
Discuss two methods for determining cosmic abundances. Explain hydrogen burning giving pp-and CN-chain reactions.
5. Sketch and explain Hubble's classification of galaxies.
OR
What is cosmic microwave background radiation Briefly discuss its significance for cosmology.
kB 1.38 x 10^-23 J
Mp 1·6 X 10^-27 kg
Mo= 2 x 10^30 kg
L0 4x 10^26 W
R0 7x 10^8m
G 6.7 x 10^-11 m^3
1 pc 3.1 x 10^16 m
A main sequence star has mass 10 x Mo. Compute the luminosity of the star in terms
of Lo.
On the Celestial sphere, show the path of circumpolar stars for an observer at latitude 0.
Explain why the temperature of chromosphere increases with height.
What are active galaxies any two active galaxies.
What would the surface magnetic field be when the Sun shrinks to the size of a neutron star with radius 11 km (Take surface magnetic field of the Sun
What is interstellar reddening What causes it?
Give two arguments In support of an expanding universe.
Locate the position of stars of spectral class B on the H-R diagram.
2. With proper sketches, explain the horizon coordinate system used for locating a celestial object. Why is it convenient to locate a celestial object with a small telescope using this system What are its shortcomings?
OR
State and prove the virial theorem for a planet going around the Sun in a circular orbit. Using the vinal theorem, estimate the number of stars in a cluster of radius 1018 m with random velocities of the order of 10^4 ms^-1. (Take the average mass of star to be equal to 10^30 kg)
3. Discuss the nebular model for the formation of the solar system. How does the nebular model explain the inconsistency in the distribution of angular momentum in the solar system?
OR
What are sunspots? Why is the temperature of sunspots lower than their surroundings Explain. Sketch the Butterfly diagram and explain its significance.
4. What are neutron stars How were they detected Calculate the gravitational red-shift for the light of wavelength 600 nm after travelling 1 m on the surface of a neutron star having mass equal to mass of the Sun and radius 15 km.
OR
Discuss two methods for determining cosmic abundances. Explain hydrogen burning giving pp-and CN-chain reactions.
5. Sketch and explain Hubble's classification of galaxies.
OR
What is cosmic microwave background radiation Briefly discuss its significance for cosmology.
kB 1.38 x 10^-23 J
Mp 1·6 X 10^-27 kg
Mo= 2 x 10^30 kg
L0 4x 10^26 W
R0 7x 10^8m
G 6.7 x 10^-11 m^3
1 pc 3.1 x 10^16 m
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
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Subjects
- Astronomy and Astrophysics
- Communication Physics
- Electric & Magnetic Phenomena
- Electrical Circuits and Electronics
- Elementary Mechanics / Ocillations & Waves
- Mathematical Methods in Physics-I/ Mathematical Methods in Physics-II
- Mathematical Methods in Physics-III
- Modern Physics
- Optics
- Physics of Solids
- Thermodynamics & Statistical Mechanics