Star A and star B both have an apparent magnitude of 7.0, but star A is at a distance of 15 pc and star B is at a distance of 30 pc. Which statement below is correct?
A) Star A appears brighter than star B, but star B and star A have the same intrinsic brightness.
B) Star B appears brighter than star A, but star B and star A have the same intrinsic brightness.
C) Star A and star B appear to have the same brightness, but star B is intrinsically brighter than star A.
D) Star A and star B appear to have the same brightness, but star A is intrinsically brighter than star B.
E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
C
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On an H-R diagram, stellar masses
A) can be determined for main-sequence stars but not for other types of stars. B) are greatest in the lower left and least in the upper right. C) decrease from upper left to lower right. D) are impossible to determine.
Procyon lies about 13 light-years distant, thus its parallax is about
A) 0.01". B) 0.25". C) 0.40". D) 0.65". E) 1.3".
A step-up transformer steps up voltage by ten times. Neglecting slight losses, if 100 W of power go into the primary coil, the power coming from the secondary coil is
A) 1 W. B) 10 W. C) 100 W. D) 1000 W. E) none of the above
The striking gap between Saturn's A and B rings is called the ________
Fill in the blank(s) with correct word