Infrared satellite detectors
A) detect shortwave radiation.
B) emit waves at the 6.7 micrometer frequency.
C) receive a weaker signal from a tall cloud than from a low-lying cloud.
D) have been phased out in favor of water vapor detectors.
Answer: C
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When food is irradiated with gamma rays from a cobalt-60 source, does the food become radioactive? Why?
A) Yes. This is why irradiation with cobalt-60 is no longer approved by the FDA. B) Yes. However, the radioactivity resulting is well below the danger level established by the FDA. C) No. The gamma rays do not have sufficient energy to initiate the nuclear reaction in the atoms of the food. D) Yes and No. Although the gamma rays initiate the nuclear reaction the radioactivity does not show up until the food is ingested.
A planet is a celestial body that
A) orbits the sun. B) has sufficient mass and therefore gravitational pull to form into a nearly spherical shape. C) cleared all other objects from the neighborhood of its orbit. D) All of the above are correct.
Why is it that rocks containing calcite occur all over the United States, yet soils containing calcite are restricted to the southwestern region?
What will be an ideal response?
What is the smallest number of carbon atoms which can be found in an unsymmetrical ether that contains only C, H and a single O atom?
A) 1 B) 2 C) 3 D) 4