Hello I've been stuck with this for ever, cant find the relevant formulas 1. The problem statement, all variables and given/known data Given that the surface area of the first heat sink, S1= 500 cm2 = 0.05 m2 2nd heat sink = ? The thermal resistance between p-n junction and case, RTjb = 0.6˚C/W The thermal resistance between the case and any heat sink, RTbh = 1.2˚C/W Power loss, P = 25W The ambient air temperature, Ta= 20˚C Heat transfer coefficient, α = 8 W/m2˚C 2. Relevant equations so how do I find out the area of the second heat sink? 3. The attempt at a solution Don't know how to start..