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ASTRO 205 (Quasars, Black Holes and Pulsars) Midterm 1 Test Questions and Answers
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ASTRO 205 (Quasars, Black Holes and Pulsars) Midterm 1 Test Questions and Answers
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ASTRO 205 (Quasars, Black Holesand Pulsars) Midterm 1 Test
Questions and Answers.
1. Why do we not find many quasars close to us?
Correct Answer -Most of the gas in galaxies has been converted to
stars, also because quasars no longer "play" with their food
2. Quasars seem to correspond to what kind of event for a galaxy?
Correct Answer -A galactic merger
3. What part of the electromagnetic spectrum do we get light from
quasars?
Correct Answer -All parts of the spectrum
4. What are Wolf - Rayet stars?
Correct Answer -The post main sequence evolutions of some massive
stars
5. What causes the absorption lines and Lyman alpha forest?
Correct Answer -Galaxies between us and a quasar
6. How bright are quasars?
Correct Answer -Brighter than an entire galaxy
,7. How does astronomical parallax work for finding distances to the
stars?
Correct Answer -The apparent difference in the position of a star over
the course of six months
8. Most methods of finding distances the objects hinge on comparing
what two values?
Correct Answer -Absolute and apparent magnitudes
9. What types of objects create type Ia supernovae?
Correct Answer -White dwarves
10. Type IB supernovae?
Correct Answer -Wolf - Rayet stars
11. Type II supernovae?
Correct Answer -10-50 solar mass stars
12. You observed two variable stars.star A has a mass of 2.5 solar
masses, Star B has a mass of 3.2 solar masses, which one will have a
longer pulsation period?
Correct Answer -star B
13. If a bubble breaks through the disc of our galaxy what
happens?
Correct Answer -a chimney is formed
, 14. We are able to find the distances to variable stars because:
Correct Answer -There periods are based on their absolute brightness
15. What is the expected lifetime of a 0.8 solar mass star, taking
into account that our sun is one solar mass and will live to be 10
billion years?
Correct Answer -16 billion years, keep in mind the formula of 10
billion divided by the number of (solar masses squared)
16. At the end of our sun's life are sun's death will generate a
Correct Answer -planetary nebula
17. Hubble's law is
Correct Answer -Speed equal to Hubble constant (70) times distance
18. In the 1950s the spectra from quasars revealed mission lines
that match no known elements. Why was this?
Correct Answer -There were Doppler shifts of more than 50%
19. Quasars are typically found where?
Correct Answer -On the other side of the observable universe
(greater than 4 billion ly)
20. What are quasars?
Correct Answer -Supermassive black hole surrounded by an accretion
disk
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