We use a j-type thermocouple to measure an aluminum piece at 390 c. if the voltage output of the thermocouple is 18.712 mv, a) find the temperature of the reference junction of this thermocouple b) find the maximum allowable time constant for this thermocouple if we want to use it to measure a temperature oscillating at an 8 hz frequency with a dynamic error less than 3% in absolute value. assume the static sensitivity k is 1.