A wave of frequency 1000 Hz vibrates at
A. more than 1000 cycles per second.
B. less than 1000 cycles per second.
C. 1000 cycles per second.
D. none of the above
Answer: C
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How is ozone produced in the upper atmosphere?
A. It diffuses from the lower atmosphere. B. It forms by reaction of oxygen molecules with UV light. C. It forms by nuclear decomposition of oxygen. D. It forms by the reaction of nitric dioxide and oxygen. E. all of the above
Which of the following statements explains why low clouds slow surface cooling at night better than clear skies do?
A. Clouds start convection currents among them. B. Water droplets in the clouds reflect infrared energy back to the Earth. C. Clouds absorb and radiate infrared energy back to the Earth. D. Clouds conduct heat better than clear night air does.
Red clay obtains its characteristic color from ________.
A. the oxidation of iron B. bacteria of the deep sea C. the silica liberated from diatoms D. calcium carbonate E. the remains of bottom organisms
Assume that the actual vapor content of the air remains constant over the course of a day. How does the relative humidity at 2:00 p.m. probably compare to the relative humidity at 5:00 a.m.?
A) The relative humidity at 2:00 p.m. is lower. B) The relative humidity is the same at 2:00 p.m. as at 5:00 a.m. C) The relative humidity at 2:00 p.m. is higher.