Solar cell systems are also called ____ systems.

a. photogenic
b. photovoltaic
c. photogeneric
d. photosensitive



b. photovoltaic

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To have a career in the conservation and environmental fields, you MUST be a "people" person

a. True b. False Indicate whether the statement is true or false

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________ use DC voltage to attract dust and contaminants to an electrically charged media or plate

A) Electronic air cleaners B) Ultraviolet lights C) Pleated filters D) HEPA filters

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Geothermal heat pumps get most of their heat from:

A) The ground. B) The surrounding air. C) A separate gas-fired boiler. D) The electricity used to operate the compressor.

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Let y (t) = x (t) ? h (t) and let x (t) = rect(t + 4) ? rect(t ? 1) and let h (t) = tri(t ? 2) + tri(t ? 6) .

(a) What is the lowest value of t for which y (t) is not zero? (b) What is the highest value of t for which y (t) is not zero?

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