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Astronomy | Astrophysics
Define an active galaxy. What is the source of its activity?
Astronomy | Astrophysics
Define an active galaxy. What is the source of its activity?
Astronomy | Astrophysics
Calculate the half-width of a spectral line of wavelength λ = 550 nm when the
temperature of the gas is 6 × 10^5
K. Assume H atoms to be emitters.
temperature of the gas is 6 × 10^5
K. Assume H atoms to be emitters.
Astronomy | Astrophysics
Explain Hubble’s scheme of galaxy classification. Why has this scheme proved
enduring? What class has been assigned to the Milky Way Galaxy?
enduring? What class has been assigned to the Milky Way Galaxy?
Astronomy | Astrophysics
The average energy of particles in the early phase of the universe, when it was very
hot, was approximately 10 GeV. Calculate the corresponding temperature.
hot, was approximately 10 GeV. Calculate the corresponding temperature.
Astronomy | Astrophysics
Obtain an expression for the radial velocity of objects in the galaxy as a function of their
galactic longitude.
galactic longitude.
Astronomy | Astrophysics
The mass and radius of a neutron star is 2MΘ 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.
value of gravitational red shift for light of wavelength 6000 Å at a distance of 2 m
from its surface.
Astronomy | Astrophysics
Explain the concept of degeneracy pressure. What role does it play in the evolution
of a star after its death?
of a star after its death?
Astronomy | Astrophysics
Write down the condition under which a large molecular cloud collapses to give rise
to new stars. Calculate the time of free fall of an HI cloud of density 106
particles/m
to new stars. Calculate the time of free fall of an HI cloud of density 106
particles/m
Astronomy | Astrophysics
What is the nature of radiation generated in the Sun’s interior? How does it differ
from the radiation we receive from the Sun?
from the radiation we receive from the Sun?
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#339914 on Dec 2023
#339914 on Dec 2023