Chips of width l =1 inch on a side are mounted to a substrate that is installed in an enclosure whose walls and air are maintained at a temperature of tsur = t[infinity]=25c. the chips have an emissivity of ε=0.60 and a maximum allowable temperature of ts =87c. 4.a) if heat is rejected from the chips by radiation and natural convection, what is the maximum operating power of each chip? the convection coefficient depends on the chip-to-air temperature difference and may be approximated as h =c(ts – t[infinity]) 1/4, where c = 4.2 w/m2 /k5/4. this is empirical formula, so simply substitute and solve. no need to put into the formula sheet.