Liquid crystal displays make use of __________
Fill in the blank(s) with correct word
polarization
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If the Earth's period of rotation were halved, but the period of revolution about the Sun stayed the same,
a. the night would be twice as long. b. the night would be half as long. c. the year would be half as long. d. the year would be half as long. e. the length of the day would be unchanged.
Which of the following is not a piece of evidence supporting the conclusion that active galactic nuclei are powered by accretion disks around massive black holes?
A) The total amount of radiation coming from the galactic center can, in some cases, exceed 100 times the total luminosity of the Milky Way Galaxy. B) Infrared observations show that many stars are forming near the centers of active galaxies. C) Observed radiation from the galactic center can vary significantly in brightness in times as short as a few days. D) Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed. E) Radio observations sometimes show long jets of material that can extend millions of light-years out from the galactic center.
When a steaming-hot aluminum soda can is quickly inverted into a pan of water, the can is dramatically crushed due to a rapid decrease in internal pressure caused by
A) contact with the cooler water. B) sudden slowing of internal air and steam molecules. C) condensation of steam inside. D) reduced thermal energy. E) rapid conduction of heat to the relatively cool water.
When subsurface ground material is completely saturated with water, we call it
A) the water table. B) groundwater. C) the saturated zone. D) the unsaturated zone.