I am sure I\'m doing the last part of this question right but am not getting the

Question

I am sure I'm doing the last part of this question right but am not getting the right answer. Please explain.

A solar cell generates a potential difference of 0.0893 V when a 500 Ohm resistor is connected across it, and a potential difference of 0.1316 V when a 1000 Ohm resistor is substituted. What is the internal resistance of the solar cell? 9.00 Times 102 ohms What is the emf of the solar cell? 2.50 Times 10-1 V The area of the cell is 5.0 cm2, and the rate per unit area at which it receives energy from light is 2.0m W/cm2. What is the efficiency of the cell for converting light energy to thermal energy in the 1000 Ohm external resistor? (Give answer in %. Do not enter unit)

Explanation / Answer

total input= 5*2mW= 10 mW

output =(0.1316/(1000+900))^2 *1000= 4.79*10^-3 mW

efficiency= output*100/input

0.0479 %

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