After a uranium fuel rod reaches the end of its fuel cycle (typically 3 years), most of its energy comes from the fissioning of plutonium because
A. fissionable Pu-239 is formed as the U-238 absorbs alpha particles from the fissioning U-235.
B. fissionable Pu-239 is formed as the U-235 absorbs neutrons from the fissioning U-238.
C. fissionable Pu-239 is formed as the U-235 absorbs alpha particles from the fissioning U-238.
D. fissionable Pu-239 is formed as the U-238 absorbs neutrons from the fissioning U-235.
Answer: D
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Indicate whether this statement is true or false.
To predict floods, scientists ____
A)monitor a stream's water levels B)evaluate a stream's past behavior C)assume the same behavior as last year D)monitor water levels and evaluate past behavior for a stream E)makes guesses, as floods cannot be predicted.
What is the term for the economic practice that you are being asked to do by assessing present versus future value of the resource?
A) Cost/benefit analysis B) Resource rating C) Temporal market valuation D) Discounting
The optimum level of pollution control is reached when ____.
A. marginal costs of pollution control begin to exceed what the public will pay for control B. marginal costs of pollution begin to exceed the marginal costs of pollution control C. the marginal cost of pollution control intersects with the marginal cost of pollution D. demand for pollution clean-up exceeds the capacity to clean pollution E. technologies become affordable to clean up pollution