A solar cell generates a potential difference of 0.064 V when a 5100 resistor is connected across it, and a potential difference of 0.090 V when a 9400 resistor is substituted. What are the (a) internal resistance and (b) emf of the solar cell? (c) The area of the cell is 2.2 cm² and the rate per unit area at which it receives energy from light is 5.0 mW/cm2. What is the efficiency of the cell for converting light energy to thermal energy in the 940 02 external resistor?
