3.[Ipt Decide whether each of the following statements are T-True, or F-False. (

Question

3.[Ipt Decide whether each of the following statements are T-True, or F-False. (If the first is T and the rest are F, enter TFFFF) A) The city of Boulder produces at most a few kilowatts of electrical power from hydroelectric plants using watershed water B) If the windspeed doubles, an ideal windmill will produce four times the power C) A realistic turbine in a modern hydroelectric plant can convert gravitational potential energy of water into electric energy at an efficiency above 80 percent D) All of the power in the solar spectrum is in a wavelength region to which silicon photovoltaic cells are sensitive E) A realistic turbine in a modern windmill can only convert kinetic energy of the air into electric energy at an efficiency below about 10-15 percent Be careful to input your answer as a string of "T's and F's", in order.

Explanation / Answer

A] False. The city of Boulder produces thousands of kilowatts of hydroelectric power.

B] If the windspeed doubles, the kinetic energy increases by a factor of 4 and so the windmill will produce four times the initial energy output.

C] True. The efficiency of a hydroelectric turbine ranges from 80-85% and can also be as high as 95%.

D] False. For energies lower than 1.1 eV [mid-infrared] which is present in the solar spectrum, the photovoltaic cell simply gives off heat.

E] True. At really high windspeeds, the efficiency can go as high as 40% but for a normal day with moderate wind speeds, the efficiency ranges from 10-20%.

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