A photovoltaic cell ________

A) makes electricity by having electrons flow from a negative to a positive layer
B) is most efficiently used at high latitudes
C) cannot be used without being tied to a power grid
D) has iron making up the greatest percentage of its weight
E) comes with a high price because of the high price of its fuel


Answer: C

Environmental & Atmospheric Sciences

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A. will be zero. B. remains the same. C. increases. D. decreases.

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Laminar flow, where water moves in approximately straight-line paths, characterizes ________

A) slow-moving streams B) the bottoms of channels C) fast-moving streams D) the edges of channels E) all of the above

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The impulse-momentum relationship Ft = change in mv, applies to a fast-moving baseball hitting a bat with a force F. Then m in the equation is the

A. mass of the ball. B. mass of the bat. C. momentum of the ball. D. none of the above

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The rate of natural increase can be zero, as in ____________, where both the birth and death rate are 9 per 1,000.

A) australia B) germany C) austria D) switzerland E) the United States

Environmental & Atmospheric Sciences