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12 marksDesign and Use of Thermometers

CAPE Physics Unit 1 · 2007 · Paper 2 · Question 8(b)(iii)b)

The resistance of a thermistor is given by the formula: R = R₀e^(B/T), where R is in ohms (Ω), T is in kelvins, and R₀ and B are constants that can be determined by measuring R at calibration points such as the ice point and the steam point. If R = 7360 Ω at the ice point and 153 Ω at the steam point.

Explain why this scale is NOT suitable for determining the value of the temperature from resistance.

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Other parts of this question

  1. 8(a)(i)State ONE situation in which a constant volume gas thermometer would be used in preference to other types of thermometers. Give a reason for your choice.[2 marks]
  2. 8(a)(ii)State, with a reason, the type of thermometer you would use to a) locate the hottest part of a Bunsen burner flame b) record the mean temperature of the gases…[4 marks]
  3. 8(a)(iii)State TWO ways in which the behaviour of a thermistor differs from that of a platinum coil when used as a resistance thermometer.[2 marks]
  4. 8(b)(i)Calculate the values of R₀ and B.[12 marks]
  5. 8(b)(ii)Determine the temperature, in degrees Celsius, when the thermistor resistance is 2200 Ω.[12 marks]
  6. 8(b)(iii)a)If an empirical temperature scale were used, what temperature would this resistance of 2200 Ω give?[12 marks]

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