According to our best present predictions about the medical consequences of the Chernobyl nuclear power plant accident, the longer-term cancer deaths caused by that accident will
A) be medically indistinguishable from cancer deaths produced by other causes.
B) be very difficult, or impossible, to detect statistically among the large number of other cancer deaths.
C) be much more numerous than the roughly 40 deaths caused directly by short-term radiation effects.
D) All of the above.
E) None of the above.
D
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A parcel of warmed air rises due to
A) random molecular motion. B) radiation. C) buoyancy. D) increased energy of its molecules.
Some food costs may rise in the future as a consequence of the increased use of which food-based fuel?
a. Ethanol b. Gasoline c. Oil d. Coal
A light ray is reflected by two mirrors that are perpendicular. The new direction of the ray is
A) 180° from the original direction. B) 135° from the original direction. C) 45° from the original direction. D) between 90° and 180° from the original direction. E) 90° from the original direction.
The star HR 4621 has an apparent magnitude of 2.6 and an absolute magnitude of -0.3 . This star is at a distance
a. closer than 10 pc. b. farther than 10 pc. c. No way to tell.