In which of the following radiation detectors is a phosphor used?
A) a Geiger-Müller counter
B) a proportional counter
C) a scintillation counter
D) all of these
C
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How would a metamorphic rock become a sedimentary rock?
A) It could melt and crystallize. B) It could eject from a volcano and cool on the earth's surface. C) It could experience weathering or erosion, later precipitating and undergoing lithification. D) It could be exposed to intense heat and pressure to form sedimentary rock.
What do the simplest vertebrates lack?
a. Jaws b. Notochord c. Central nervous system d. Teeth
Why do most tornadoes in the central U.S. occur during the spring months?
A) Solar energy is a maximum. B) Air-mass contrasts are greatest. C) Surface air is most humid. D) Divergence of air aloft is greatest. E) Upper-air temperatures are warmest.
An aqueous-phase leachate plume will always move in the direction of:
a. decreasing hydraulic gradient b. increasing hydraulic gradient c. decreasing hydraulic conductivity d. increasing hydraulic conductivity