Cancer is low in Denver because
A. the radiation is lower
B. the radiation is higher
C. there are more gamma rays even though there are fewer betas
D. We don't know why.
Answer: D. We don't know why.
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Time Dilation: A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7% the speed of light. It is unstable, and is observed to decay in an average 37.0 ?s. If this particle were at rest in the laboratory, what would be its average lifetime?
A. 2.9 µs B. 18 µs C. 5.3 µs D. 12 µs E. 4.3 µs
An air bubble underwater has the same pressure as that of the water. As the air bubble rises toward the surface (and its temperature remains constant), the volume of the air bubble
A) increases. B) decreases. C) remains constant. D) increases or decreases, depending on the rate it rises.
To what do the terms node and antinode refer?
a) antinodes are points of no oscillation; nodes are points of maximum oscillation b) nodes are points of no oscillation; antinodes are points of maximum oscillation
8.0 grams of water initially at 100°C are poured into a cavity in a very large block of ice initially at 0°C. How many g of ice melt before thermal equilibrium is attained?
A) 10 g B) 900 g C) 500 g D) 100 g E) an unknown amount; it cannot be calculated without first knowing the mass of the block of ice