Astronomy Chapter Eleven
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- 1.Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ?
- A.
Location where they are formed
- B.
Time they are formed
- C.
Luminosity they are formed with
- D.
Mass they are formed with
- E.
Color they are formed with
- 2.What are the standard units for luminosity?
- A.
Watts
- B.
Joules
- C.
Newtons
- D.
Kilograms
- E.
Watts per second
- 3.A star's luminosity is the
- A.
Apparent brightness of the star in our sky.
- B.
Surface temperature of the star.
- C.
Lifetime of the star.
- D.
Total amount of light that the star will radiate over its entire lifetime.
- E.
Total amount of light that the star radiates each second.
- 4.If the distance between us and a star is doubled, with everything else remaining the same,the luminosity
- A.
Is decreased by a factor of four, and the apparent brightness is decreased by a factor of four.
- B.
Is decreased by a factor of two, and the apparent brightness is decreased by a factor of two.
- C.
Remains the same, but the apparent brightness is decreased by a factor of two.
- D.
Remains the same, but the apparent brightness is decreased by a factor of four.
- E.
Is decreased by a factor of four, but the apparent brightness remains the same.
- 5.Which of the following correctly states the luminosity-distance formula?
- A.
Luminosity = apparent brightness / 4π x (distance)^2
- B.
Apparent brightness = luminosity / 4π x (distance)^2
- C.
Apparent brightness = luminosity x 4π x (distance)^2
- D.
Distance = luminosity / 4π x (apparent brightness)^2
- 6.Suppose you measure the parallax angle for a particular star to be 0.1 arcsecond. Thedistance to this star is
- A.
10 light-years.
- B.
10 parsecs.
- C.
0.1 light-year.
- D.
0.1 parsec.
- E.
Impossible to determine.
- 7.The spectral sequence sorts stars according to
- A.
Mass.
- B.
Surface temperature.
- C.
Luminosity.
- D.
Core temperature.
- E.
Radius.
- 8.The spectral sequence in order of decreasing temperature is
- A.
OFBAGKM.
- B.
OBAGFKM.
- C.
OBAFGKM.
- D.
ABFGKMO.
- E.
BAGFKMO.
- 9.Which of the following terms is given to a pair of stars that appear to change positions in the sky, indicating that they are orbiting one another?
- A.
Visual binary
- B.
Eclipsing binary
- C.
Spectroscopic binary
- D.
Double star
- E.
None of the above
- 10.Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
- A.
Surface temperature on the horizontal axis and luminosity on the vertical axis
- B.
Mass on the horizontal axis and luminosity on the vertical axis
- C.
Surface temperature on the horizontal axis and radius on the vertical axis
- D.
Mass on the horizontal axis and stellar age on the vertical axis
- E.
Interior temperature on the horizontal axis and mass on the vertical axis
- 11.On a Hertzsprung-Russell diagram, where would we find stars that are cool and dim?
- A.
Upper right
- B.
Lower right
- C.
Upper left
- D.
Lower left
- 12.On a Hertzsprung-Russell diagram, where would we find stars that are cool and luminous?
- A.
Upper right
- B.
Lower right
- C.
Upper left
- D.
Lower left
- 13.On a Hertzsprung-Russell diagram, where would we find stars that have the largest radii?
- A.
Upper right
- B.
Lower right
- C.
Upper left
- D.
Lower left
- 14.On a Hertzsprung-Russell diagram, where would we find red giant stars?
- A.
Upper right
- B.
Lower right
- C.
Upper left
- D.
Lower left
- 15.On a Hertzsprung-Russell diagram, where would we find white dwarfs?
- A.
Upper right
- B.
Lower right
- C.
Upper left
- D.
Lower left
- 16.Which of the following luminosity classes refers to stars on the main sequence?
- A.
I
- B.
II
- C.
III
- D.
IV
- E.
V
- 17.Which of the following is true about low-mass stars compared to high-mass stars?
- A.
Low-mass stars are cooler and less luminous than high-mass stars.
- B.
Low-mass stars are hotter and more luminous than high-mass stars.
- C.
Low-mass stars are cooler but more luminous than high-mass stars.
- D.
Low-mass stars are hotter but less luminous than high-mass stars.
- E.
Low-mass stars have the same temperature and luminosity as high-mass stars.
- 18.Which of the following statements about an open cluster is true?
- A.
All stars in the cluster are approximately the same color.
- B.
All stars in the cluster are approximately the same age.
- C.
All stars in the cluster have approximately the same mass.
- D.
All stars in the cluster will evolve similarly.
- E.
There is an approximately equal number of all types of stars in the cluster.
- 19.Cluster ages can be determined from
- A.
Main sequence fitting.
- B.
Main sequence turnoff.
- C.
Pulsating variable stars.
- D.
Spectroscopic binaries.
- E.
Cluster ages can be determined from A) main sequence fitting. B) main sequence turnoff. C) pulsating variable stars. D) spectroscopic binaries. E) visual binaries.
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