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1. A solar cell of 10cmx10cm size and with an energy band gap of 1.42 ev has an efficiency 17= 12%, when it is operating under the standard sunlight condition (AM1.5 solar spectrum and solar power of 1000 W/m- ). The open circuit voltage Fe of this solar cell is 0.6 V, the short circuit current / is 3.5 A. and the voltage at maximum power I'm is 0.5 V. (a). Find the lowest-frequency photon that can promote an electron from the valence band to the conduction band and the wavelength of this photon. [4 marks] (b). What is the maximum power output of this solar cell? [3 marks] (c). What is the current at the maximum power? [3 marks] (d). What is the Fill Factor of this solar cell? [3 marks] (c). How many solar cells are needed in order to produce a maximum power output of 450 W? [3 marks] (D. If the incident solar power is 1000 W/m- for 6 hours of the day, 500 W/me for 3 hours and then zero for the rest of the day, what is the average power output of this solar cell over a one- day period when it is operating at the maximum power output mode? Assume the efficiency n is the same at 1000 W/m* and 500 W/m?. [4 marks]