1. A globular cluster is 1 kiloparsec away. What is its parallax?
a. .001 seconds of arc
b. 1 second of arc
c. 1000 seconds of arc
d. .1 seconds of arc
1. Suppose you are an astronomer on Jupiter (distance to the Sun = 5 AU). You observe a star with a parallax of 0.1 arcseconds. What is the star's distance?
a. 0.05 pc
b. 0.1 pc
c. 2 pc
d. 5 pc
e. 50 pc
1. The nearest star is at a distance of about
a. 1 light year.
b. 1 parsec.
c. 100 parsecs.
d. 1 arcsecond.
e. 1 kiloparsec.
1. Which of the following correctly describes the relative distances of the stars and planets? The stars are
a. about 10 times farther away than the nearest planets.
b. about 100 times farther away than the nearest planets.
c. about 100,000 times farther away than the nearest planets.
d. several billion times farther away than the nearest planets.
1. By what factor would the apparent brightness of a star increase if an observer moved from 5 parsecs to 1 parsec from the star?
a. 5 times
b. 25 times
c. 125 times
d. 625 times
1. What kind of stars are found scattered across the top of the H-R diagram?
a. white dwarfs
d. main sequence stars
1. The stars located in the lower left corner of the H-R diagram are
a. white dwarfs.
b. main sequence stars.
1. If we choose a typical star in the vicinity of the Sun, it will be a
a. spectral class O star.
b. Cepheid variable.
c. neutron star.
d. Lower Main Sequence Red Dwarf.
1. An H-R diagram can be made by plotting
a. luminosity versus color.
b. spectral class versus distance.
c. luminosity versus magnitude.
d. temperature versus distance.
1. How much fainter is a twelfth magnitude star than an eighth magnitude star?
a. 4 times
b. 10 times
c. 40 times
d. 2.5 times
1. Two stars, which differ in magnitude by 5, have a brightness ratio of
1. How does the brightness of a fourth magnitude star compare with that of a ninth magnitude star?
a. It is 5 times brighter.
b. It is 5 times fainter.
c. It is 100 times brighter.
d. It is 100 times fainter.
1. On a certain date, Mars has an apparent magnitude of +1 and Venus has an apparent magnitude of +2. Which is brighter and by how much?
a. Venus is twice as bright as Mars.
b. Venus is 2.5 times as bright as Mars.
c. Mars is twice as bright as Venus.
d. Mars is 2.5 times as bright as Venus.
e. Mars is 100 times as bright as Venus.
1. A measurement of the parallax of a star allows us to determine the star's
a. rotation rate.
1. If two stars have teh same Absolute Magnitude, then they necessarily have the same...
c. ...brightness as we perceive it.
1. Star A has 4 times the radius of star B and is twice as hot. How does the luminosity of star A compare to that of star B?
a. 8 times as great
b. 1024 times as great
c. 16 times as great
d. 256 times as great
1. A solar-type star is observed with an apparent magnitude of 12.7. How far away is it? Recall that the absolute magnitude of the Sun is 4.7.
a. 10 parsec
b. 40 parsecs
c. 400 parsecs
d. 1000 parsecs
1. Two stars have the same color, but differ by 5 magnitudes in absolute magnitude. What stellar property must be different in the two objects and by how much?
a. The star with the smaller Absolute Magnitude (value) is 10 times closer.
b. The star with the bigger Absolute Magnitude (value) is 10 times closer.
c. The star with the smaller Absolute Magnitude (value) is 10 time bigger in diameter.
d. The star with the bigger Absolute Magnitude (value) is 10 time bigger in diameter.
1. Star A is twice as hot as star B. The two stars have the same radius. How does the luminosity of star A compare to that of star B
a. A and B have the same luminosity.
b. A is twice as luminous.
c. A is 4 times as luminous.
d. A is 16 times as luminous.
1. The star Capella has an apparent magnitude of 0 and is the same color as the Sun. Its distance is 14 parsecs. Which of the following describes its similarities with the Sun?
a. It must be identical to the Sun.
b. It is less luminous than the Sun, but has the same temperature.
c. It is more luminous than the Sun, but has the same temperature.
d. It is the same luminosity as the Sun, but has a different temperature.
1. A star with a trigonometric parallax of .02 arcseconds has a distance of
a. 20 pc.
b. 50 pc.
c. 2.0 light years.
d. 4 kpc.
e. need more information (magnitudes)
1. Stars of different spectral classes, O, B, A, F, G, K, M, show differences in the strengths of absorption lines of various elements. These differences are due to
a. differences in the chemical compositions of stars
b. differences in the surface temperatures of stars
c. differences in stellar distances
d. differences in stellar ages
1. A star is observed to have extremely strong lines of hydrogen, very weak neutral helium, and weak neutral metals. The spectral type of such a star is closest to
1. Consider two stars X and Y with surface temperatures of 3000 K and 10,000 K respectively. Which of the following is true?
a. Star X has less hydrogen.
b. Star Y has less hydrogen.
c. Hydrogen absorption lines will be stronger in star X.
d. Hydrogen absorption lines will be stronger in star Y.
1. What spectral class is the next cooler after spectral class F?
1. What spectral class is found between O and A?
1. The hottest stars have spectral class
1. Which of the following spectral classes is coolest?
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