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IGNOU PHE-15
- Astronomy and Astrophysics,
Latest Solved Assignment

(January 2022 - December 2022)

PHE-15 Assignment

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IGNOU PHE-15 January 2022 - December 2022 - Solved Assignment

Are you looking to download a PDF soft copy of the Solved Assignment PHE-15 - Astronomy and Astrophysics? Then GullyBaba is the right place for you. We have the Assignment available in English language.

This particular Assignment references the syllabus chosen for the subject of Physics, for the January 2022 - December 2022 session. The code for the assignment is PHE-15 and it is often used by students who are enrolled in the B.Sc. Degree.

Once students have paid for the Assignment, they can Instantly Download to their PC, Laptop or Mobile Devices in soft copy as a PDF format. After studying the contents of this Assignment, students will have a better grasp of the subject and will be able to prepare for their upcoming tests.

IGNOU PHE-15 (January 2022 - December 2022) Assignment Questions

1. a) Express the distance of the star Proxima Centauri from the star Sirius B and the planet Earth in light years.
b) Draw the celestial sphere and show the observer’s meridian, zenith, celestial equator and the horizon for an observer at latitude 30°N. Show the horizon coordinates of a star X on the celestial sphere for this observer. Would these coordinates be the same at latitude 60°N?
c) Which telescope, optical or X-ray, would have higher resolving power for the same aperture? Calculate the magnitude of the faintest object that a 15 m optical telescope can detect.
d) The average temperature of the interior of a sun-like star is of the order 108 K. Estimate the mass of the star in terms of the solar mass if it has a radius of order 10 10 cm.

2. a) List different layers of the Sun’s atmosphere. Explain why the temperature in the chromosphere increases with height. How is solar wind generated?
b) If the pressure in the solar atmosphere is 104 Pa, calculate the strength of the magnetic field required to balance it (pressure).
c) State nebular hypothesis. Explain the formation of solar system as per the nebular model.

3. a) Discuss Jeans criterion for the formation of stars and obtain an expression for Jeans mass and Jeans length.
b) A supernova explosion takes place at the distance of 4 pc. If the absolute magnitude of the supernova is -25, calculate its apparent magnitude. Will the supernova be brighter than the Sun? Justify your answer.
c) Discuss the qualitative difference between a main sequence star and a compact star. Show that, as the mass of the white dwarf increases, its radius decreases.

4. a) Distinguish between spiral and barred spiral galaxies giving examples of each type of galaxy.
b) What is a Seyfert galaxy? Explain how broad-line and narrow-line regions originate in a Seyfert galaxy.
c) Using the virial theorem, explain why there is a need to postulate the existence of dark matter.
d) A galaxy of absolute magnitude of -20 is at a distance of 100 kpc. Would it be visible to the naked eye?

PHE-15 Assignment Details

  • University IGNOU (Indira Gandhi National Open University)
  • Title Astronomy and Astrophysics
  • Language(s) English
  • Session January 2022 - December 2022
  • Code PHE-15
  • Subject Physics
  • Degree(s) B.Sc.
  • Course Core Courses (CC)
  • Author Gullybaba.com Panel
  • Publisher Gullybaba Publishing House Pvt. Ltd.

Assignment Submission End Date

The IGNOU open learning format requires students to submit study Assignments. Here is the final end date of the submission of this particular assignment according to the university calendar.

  • 30th April (if Enrolled in the June Exams)
  • 31st October (if Enrolled in the December Exams).

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English Language

  • January 2022 - December 2022 18 Pages (0.00 ), PDF Format SKU: IGNGB-AS-BS-PHE15-EN-115

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