**21.  A digital thermometer employs a thermistor as the temperature-sensing element. A thermistor is a kind of semiconductor and has a large negative temperature coefficient of resistivity a. Suppose that a = - 0.060 (C°)-1 for the thermistor in a digital thermometer used to measure the temperature of a patient. The resistance of the thermistor decreases to 85% of its value at the normal body temperature of 37.0 °C. What is the patient’s temperature?

 

Resistance as a function of temperature can be found from

 

We are informed that

 

Solve for T

 

 

 

 

 

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This page last updated on June 14, 2018