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1 markDesign and Use of Thermometers

CAPE Physics Unit 1 · 2002 · Paper 2 · Question 3(a)(ii)

A thermocouple is constructed by placing a cold junction in melting ice and heating a hot junction.

Why is it suitable to take temperature readings of a substance when it is cooling down rather than while it is heating up?

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Other parts of this question

  1. 3(a)(i)Draw a suitable circuit diagram to show how the thermocouple is constructed.[3 marks]
  2. 3(a)(iii)How can the thermocouple thermometer be made to respond better to changes in temperature?[2 marks]
  3. 3(b)(i)From the graph find the temperature of the hot junction when the e.m.f. is 14 mV.[1 mark]
  4. 3(b)(ii)Use this formula to calculate the temperature when the e.m.f. is 14 mV.[2 marks]
  5. 3(b)(ii)Account for the different values of temperature in (b)(i) and (b)(ii).[1 mark]

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