A solar cell generates a potential dissimilarity of 0.24 V when a 530Ω resistor is connected across it, and a potential difference of 0.35 V when a 880 Ω resistor is substituted. What are the (a) internal resistance and (b) emf (in V) of the solar cell? (c) The area of the cell is 2.6 cm2 and the rate per unit area at which it receives energy from light is 5.4 mW/cm2. What is the efficiency of the cell for converting light energy to thermal energy in the 880 Ω external resistors?