I have a huge test today, and I’m working on the review questions (there are tons) She never gave us the answers… :\
Here are the select few that I’m unsure about. Any help would be great
1) The final step in transporting energy to the surface of the Sun is via convection.
2) Observations of sunspots at different solar latitudes prove that the Sun rotates differentially
3) The majority of stars near us in space would fall on the lower right portion of the main sequence (on an H-R diagram)
4) A +6.0 magnitude star is brighter than a +3.0 magnitude star.
5) Less than 100 stars lie within 5 parsecs of the sun
1) The stars a Cygni and b Cygni are in the constellation Cygnus. Which statement is true?
a) b cygni appears brighter
b) a cygni appears brighter
c) b appears redder
d) b is hotter
2) As the Sun rotates, an individual sunspot can be tracked across its face. From eastern to western limb, this takes about…
a) 12 hours
b) a week
c) two weeks
d) a month
e) 5.5 years
3) On a night when the human eye can see a fourth magnitude star, a 60mm telescope with 100x the surface area as our pupil, would be able to just barely detect
a) eleventh magnitude Tethys, Saturn’s second largest moon
b) Seventh magnitude Titan, Saturn’s largest moon
c) eighth magnitude Uranus
d) ninth magnitude Barnard’s star
e) thirteenth magnitude Pluto
this question is frustrating me, because I’m not sure specifically which is right (it’s a, c, or e, right?)
4) What are the characteristics of an open cluster?
a) a star forming region, hundreds of light years across, with many blue MS stars
b) old age and tens of thousands of stars
c) millions of stars, both young and old, spread out over 100,000 ly
d) no stars left on the main sequence, but millions of white dwarfs
e) a few hundred stars, most still on the main sequence
5) Why are star clusters ideal “laboratories” for stellar evolution?
a) the combined light of all the stars makes them easier to see
b) their stars are all the same composition and stage in evolution.
c) their stars are all about the same age, composition, and distance from us
d) their stars are all about the same mass and temperature
e) like our sun, they lie in the plane of the Milky Way
6) A star will spend most of its life
a) on the main sequence
b) inside its planetary nebula
c) in repeated swellings to the red giant.
d) as a protostar
e) in a sustained helium flash lasting billions of years
7) Can a star become a red giant more than once?
a) no, it will lose so much mass as to cross the Chandrasekhar Limit
b) no, or we would see them as the majority of naked – eye stars
c) yes, before and after the helium flash
d) no, the planetary nebula blows off all the outer shells completely
e) yes, before and after the Type II supernova event.
THANK YOU SO MUCH
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