Which type of binary gives information about the star sizes in addition to the combined masses?
A. eclipsing binary
B. spectroscopic binary
C. visual binary
D. apparent binary
E. astrometric binary
Ans: A. eclipsing binary
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Which of the following best describes how and why x-ray telescopes differ from visible light telescopes?
A) X-ray telescopes use grazing incidence mirrors because x-ray photons will penetrate a normal mirror. B) X-ray telescopes must be much larger because of the small number of x-ray photons. C) X-ray telescopes cannot do spectroscopy because all x-ray photons have the same wavelength. D) X-ray telescopes have to be built with very thick mirrors because x-ray photons will penetrate a thin mirror. E) X-ray telescopes do not use mirrors because x-ray photons cannot be focused.
Which of the solar system objects listed below is most similar to Earth in terms of mass and density?
a. Mercury b. Moon c. Venus d. Mars e. Deimos
Cold damp weather along the eastern coast of the United States is most likely caused by a
A) continental tropical air mass. B) continental polar air mass. C) maritime tropical air mass. D) maritime polar air mass.
A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. In what direction must the boat be pointed in order to accomplish this?
A. 23° west of north B. 20° west of north C. 24° west of north D. 22° west of north E. 17° west of north