The axes on a Hertzsprung-Russell (H-R) diagram represent
A) mass and luminosity.
B) luminosity and surface temperature.
C) luminosity and apparent brightness.
D) mass and radius.
B
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A continuous spectrum is produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer
Entropy: When water at 0°C freezes, the entropy of the water
A. increases. B. decreases. C. remains constant. D. could either increase or decrease; it depends on other factors.
The number of protons in a neutral atom is balanced by an equal number of
A) electron shells that surround the nucleus. B) neutrons in the nucleus. C) orbital electrons. D) none of the above
Jupiter's moon named ______________ is volcanically active
Fill in the blank(s) with correct word