A silicon chip measuring 5 mm on both sides and 1 mm in thickness is embedded in a ceramic substrate. At steady state, the chip has an electrical power input of 0.225 W. The top surface of the chip is exposed to a coolant whose temperature is 20 °C. The rate of energy transfer by heat between chip and the coolant is given by Q̇ = -hA(Tb - Tf) where Tb and Tf are the surface and coolant temperatures respectively. A is surface area and h = 150 W/m2.K.
If heat transfer between the chip and the substrate is negligible, determine the surface temperature of the chip, in °C.Enter numerical value using the virtual keypad. Round off where necessary.