x= % light absorption at 5800 A and y=peak voltage
x= 4.0, 8.7, 12.7, 19.1, 21.4, 24.6, 28.9, 29.8, 30.5
y= 0.12, 0.28, 0.55, 0.68, 0.85, 1.02, 1.15, 1.34, 1.29
Give an estimate of the change in expected peak voltage with a 1% increase in light absorption. Estimate the expected value of peak voltage when % light absorption is 20.