Astronomy | Astrophysics Answers

3d) Explain the difference between rigid body rotation and Keplerian motion. What is

galactic longitude?

3c) The mass and radius of a neutron star is 2M and 15 km, respectively. Calculate the

value of gravitational red shift for light of wavelength 6000 Å at a distance of 2 m

from its surface

3b) What is planetary nebula? Explain the concept of Chandrasekhar limit.

3. a) Explain the concept of degeneracy pressure. What role does it play in the evolution

of a star after its death?

2e) What are the characteristic features of the H II region of ISM? How is it different

from the molecular cloud?

2d) What is solar nebula? Explain the formation of nebular disk.

2c) What are the main differences between the terrestrial and jovian planets? How does

the ring system of jovian planets persist for so long?

2b) Explain helioseismology. How does it help in understanding the internal structure

of the Sun?

2. a) What is the nature of radiation generated in the Sun’s interior? How does it differ 

from the radiation we receive from the Sun? What causes granulation of the 

photosphere?

1e) The average density of a white dwarf of radius 109

cm is 106

gm/cm3

. Is general

theory of relativity needed to study the dynamics of this star? What happens if the

star shrinks to a radius thousand times smaller?