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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

Jupiter's moon named ______________ is volcanically active

Fill in the blank(s) with correct word

Physics & Space Science

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.

Physics & Space Science