Problem 3) [30 pts] The temperature of a gas stream is to be measured by a thermocouple whose measuring point (i.e., junction) can be approximated as a 1.2-mm-diameter sphere. The properties of the junction are k=35W/mC,=8500kg/m3, and Cp=320J/kgC, and the heat transfer coefficient between the junction and the gas is h=65W/mC. How long it will take for the difference between the gas stream temperature and the temperature read by the thermocouple (i.e., the temperature at the center of the thermocouple) to drop to 1% of its initial value." Final Answer: (c) 38.5s