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A solar cell generates a potential difference of 0.1279 V when a 500 Ω resistor is...

A solar cell generates a potential difference of 0.1279 V when a 500 Ω resistor is connected across it, and a potential difference of 0.1926 V when a 1000 Ω resistor is substituted. What is the internal resistance of the solar cell? What is the emf of the solar cell? The area of the cell is 5.0 cm^2, and the rate per unit area at which it receives energy from light is 2.0m W/ cm^2. What is the efficiency of the cell for converting the light energy to thermal energy in the 1000 Ω external resistor?

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