College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Chapter 20, Problem 37PE
(a) Digital medical thermometers determine temperature by measuring the resistance of a semiconductor device called a thermistor (which has a= - 0.0600/°C ) when it is at the same temperature as the patient. What is a patient's temperature if the thermistor’s resistance at that temperature is 82.0% of its value at 37.0°C (normal body temperature)? (b) The negative value for a may not be maintained for very low temperatures. Discuss why and whether this is the case here. (Hint: Resistance can’t become negative.)
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(a) Digital medical thermometers determine temperature by measuring the resistance of a semiconductor device called a thermistor (which has α = – 0.0600 / ºC ) when it is at the same temperature as the patient. What is a patient’s temperature if the thermistor’s resistance at that temperature is 82.0% of its value at 37.0ºC (normal body temperature)?(b) The negative value for α may not be maintained for very low temperatures. Discuss why and whether this is the case here. (Hint: Resistance can’t become negative.)
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A 5-meter-long conductor wth the diameter of 5mm is connected to a source and an external resistance. The temperature of the conductor changes from 25 degrees to 35 degrees. Determine the resistivities and resistances at each temperature. Thermal coefficient of the conductor is 40 x 10-3 and the conductivity at 20°C is 2.5465 x 104 per ohm-meter.
Chapter 20 Solutions
College Physics
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