11 Two copper-constantan thermocouples with 1- and 2-mm diameters are dipped into boiling water from ambient (20°
C). The heat-transfer coefficient to the thermocouples is 3000 W/m 2°
C. Determine the output from each thermocouple in 1,5 , and 10 s. Estimate the time beyond which they will read the same temperature (within 0.1°
C ). Assume the properties of copper-constantan to be the same as those of copper, and assume that the junction is spherical.