Which of the following comparisons between low-mass stars and high-mass main-sequence stars is true?
A) Low-mass stars are hotter and more luminous than high-mass stars.
B) Low-mass stars are hotter but less luminous than high-mass stars.
C) Low-mass stars are cooler but more luminous than high-mass stars.
D) Low-mass stars have the same temperature and luminosity as high-mass stars.
E) Low-mass stars are cooler and less luminous than high-mass stars.
E
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Which of the following is not a unit of radiation dose?
a. rem b. roentgen c. rad d. RBE
A doorbell has an input voltage of 120 V. A transformer that steps the voltage down to 12 V has 500 turns on its primary. What is the number of turns on the secondary?
The lithosphere "floats" on the asthenosphere, and the parts of lower density float higher. This state of buoyancy is called
a. specific continuity. b. isostasy. c. the syncline anomaly. d. remanent balance.
An air mass with circulatory motion is called
A) convectional. B) orographic. C) adiabatic. D) frontal.