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Astronomy | Astrophysics
With the help of a diagram, explain the unified scheme for understanding active
galactic nuclei.
galactic nuclei.
Astronomy | Astrophysics
Ques. Describe Hubble’s Classification scheme for galaxies.
Astronomy | Astrophysics
Questions.Describe the composition of the interstellar medium. Explain how it has been
possible to map the HI clouds.
possible to map the HI clouds.
Astronomy | Astrophysics
The mean free path of photons in stars is of the order of 0.2 cm. Show that the time
taken for a photon to reach the surface of a star of radius 4 Ro is of the order of one
million year.
taken for a photon to reach the surface of a star of radius 4 Ro is of the order of one
million year.
Astronomy | Astrophysics
Ques. Derive the expression for the mean temperature in a star:
< T > M^2/3 < P > ^1/3
< T > M^2/3 < P > ^1/3
Astronomy | Astrophysics
Derive Jeans criteria for the stability of a gas cloud. A collapsing cloud is made only
of neutral hydrogen (H1). If the temperature of the cloud is 50 K and its number
density is 10^5 m−3, calculate its Jeans mass.
of neutral hydrogen (H1). If the temperature of the cloud is 50 K and its number
density is 10^5 m−3, calculate its Jeans mass.
Astronomy | Astrophysics
Derive an expression for the tidal force for the earth-moon system and show that its
magnitude depends on the latitude. Explain tidal bulge on the basis of this
expression.
magnitude depends on the latitude. Explain tidal bulge on the basis of this
expression.
Astronomy | Astrophysics
Ques. Explain how sunspots survive for so long even though they are surrounded by hotter
matter.
matter.
Astronomy | Astrophysics
Explain how we estimate the effective surface temperature of the Sun. A main
sequence star has mass 2 × 10^31 kg and radius 3 × 10^9 m. Obtain an estimate of the
average temperature throughout the star.
sequence star has mass 2 × 10^31 kg and radius 3 × 10^9 m. Obtain an estimate of the
average temperature throughout the star.
Astronomy | Astrophysics
Questions:- The local time at Chennai is 9 p.m. Calculate the local time at Mumbai at that time.
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#340153 on Dec 2023
#340153 on Dec 2023