Doppler radar can
a. catch speeders.
b. measure the speed of a pitcher's fastball.
c. detect tornadoes.
d. do all of the above.
d
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Which type of binary system have pairs of stars that are so close together that they look like one single point?
a. radio binary b. eclipsing binary c. visual binary d. spectroscopic binary e. neutron star binary
An atom's mass number is determined by the number of
A) neutrons in its nucleus. B) nucleons in its nucleus. C) protons in its nucleus. D) alpha particles in its nucleus. E) electron masses in its nucleus.
When the absolute magnitudes, or brightnesses, of stars are plotted against their surface temperatures or colors, we obtain a(n)
a. Hertzsprung-Russell (or H-R) diagram. b. straight line. c. random pattern. d. none of the above
What did Galileo discover about Jupiter that supported Copernicus?
What will be an ideal response?