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Tuesday, July 14, 2009

A Guide for Astronomy & Astrophysics Olympiad 2009 (Part 1)

A Guide for Astronomy & Astrophysics Olympiad 2009 (Part 1)
Today, I'm gonna provide you with some supplement for the Astronomy & Astrophysics Olympiad 2009, to be held on 18th of July 2009 at island wide locations. In fact I'm providing you with this past paper of Astronomy & Astrophysics Olympiad held in 2007. I think this could be a highly valued learning resource for those who are in need and taking part at the national and international level competitions. Please go through these questions and let me know how you feel. Don't hesitate to contact me if you have an inquiry whatsoever, related to these questions.

1. Solar atmosphere can be divided into three major parts based on temperature. They are
photosphere, chromosphere and corona. The most suitable answer for the average temperature
of the corona is

a) 6000 K b) 10000 K c) above 100000 K d) 3500 K

2. The sidereal day is 3 minutes and 56 seconds less than a solar day. This time difference is due to
a) Earth’s rotation
b) Sun’s rotation
c) Sun’s motion around the galactic center
d) Earth’s revolution around the Sun

3. The Polaris will not always be the North star due to

a) The sidereal day being shorter than the solar day
b) Due to the precession of the Earth’s axis.
c) The Earth's period being slightly longer than 365 days.
d) The Solar wind blowing the Earth away from the sun.

4. An observer standing 30o north from equator observes a star at zenith (right above the head). If the observer moves along the same longitude, 90o to the south from where he is, what could be the new altitude of the star?

a) 0o b) 30o c) 60o d) 90o

5. Red shift of the spectral lines show the distance galaxies are moving away from us. A spectrum of certain galaxy is observed in the H alpha region and found wavelength of H alpha absorption line is 6564.64 Armstrong. If the laboratory wavelength H alpha is 6563 Armstrong and the speed of light (C) is 300,000 km s-1 find the receding speed of
the galaxy.

a) 35 km s-1 b) 50 km s-1 c) 65 km s-1 d) 75 km s-1

6. The different bands of electromagnetic radiation consist of little packets of energy, called
photons traveling through space. The amount of energy this packet possess is directly
proportionate to their frequency. Find energy of such electromagnetic wave which has the
wavelength of 5000A (5x10-7 m). The speed of light 3x108 m s-1 and Plank constant
6.625x10-34 J s .

a) 39.75x1038 J b) 39.75x10-20 J c) 39.75x10-20 J s d) 30.34x1030 J s

7. The hydrogen in interstellar medium is generally quite cold (if it is not in the vicinity of warm
stars) and found in its atomic or neutral ground state. Such clouds are called HI regions. Cold
interstellar hydrogen emits radiation in radio region at the wavelength of

a) 26 cm b) 21 cm c) 5910 A0 d) 1000 nm

8. The term “Hot Jupiters” is a commonly used word among the planetary scientists in the world. This explains

a) The Jupiter formed much closed to the Sun few billions years ago.
b) Volcanic eruptions heat up the Jupiter’s surface.
c) Discovered some Jupiter size extra-solar planets are closer to the parent star than the
distance between the Sun and Jupiter.
d) The Jupiter becomes a star in the future.

9. Stars are born, evolve and die. The primary mass of the star decides the way it destroys. A star which is comparable to the Sun’s mass destroys as

a) Supernovae b) Novae c) Planetary nebulae d) X-ray burst

10. A, B, and C are three stars with temperatures of 6000K, 24000K, and 3500K, respectively.
What is the possible color sequence of those stars A, B and C, respectively.

a) Yellowish, Bluish, Reddish b) Reddish, Bluish, Yellowish
c) Bluish, Yellowish, Reddish d) Yellowish, Reddish, Bluish

The rest of the questions are continued here