Glass is opaque to light with wave frequencies that
A. match its natural frequencies.
B. are below its natural frequencies.
C. both of these
D. none of the above
Answer: A
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Deuterium oxide, D2O, and water, H2O, have the same chemical structure and differ only in that D2O possesses the deuterium isotope of hydrogen, whereas water possesses the protium isotope. Deuterium oxide, also known as "heavy water," is 11% heavier than water. Might you expect its boiling temperature also to be about 11% greater? Why or why not?
A. Since deuterium is radioactive, it breaks down more easily, so it has a lower boiling temperature than water. B. The mass of the molecules has a far greater influence on the boiling temperature of the substance than does the polarity of the molecules, so D2O boils at a higher temperature. C. Since boiling temperature is a measure of the speed of a molecule, the heavier molecules move slower and thus have a higher boiling temperature. D. Since they have the same chemical structures, there is a similar molecular attraction between the molecules, so their boiling temperatures are similar.
What organism uses the tides, specifically high spring tides, to time their breeding behaviors?
A) Fiddle crabs B) Grunion C) Hantzchia D) San crabs
If the P-S time intervals are known from at least three seismograph stations, the ____ of any earthquake can be determined
A)focal depth B)intensity C)magnitude D)probability of a tsunami E)epicenter
Critics of _________________ claim that it is nothing more than a legal method of pillaging and plundering the world's workforce and its resources.
-technological innovation -none of these is correct -free trade -globalization -corporate colonialism