The answer to the previous question is A. Those tubes are cutting-edge solar hot water technology. The tubes circulate a combination of water and alcohol, which turns to steam in the sun. The heat generated by the tubes is eventually transferred to a hot water tank to preheat a traditional hot water heater.
Next question: This building has two types of solar energy technologies on it. Pick the correct combination:
A. Two solar hot water panels on left and three solar photovoltaic panels on right.
B. Five solar photovoltaic panels.
Answer and new question on next page.
March 16, 2009 4:00 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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