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1 markDesign and Use of Thermometers

CAPE Physics Unit 1 · 2017 · Paper 2 · Question 6(b)(iv)

In an experiment to measure the specific heat capacity of water, a stream of water flows at a steady rate of 5.0 g s⁻¹ over an electrical heater dissipating 140 W. A temperature rise of 5.0 K is observed. A quantity, L, of the heat supplied is lost to the environment. On increasing the rate of flow of water to 10.0 g s⁻¹, the same temperature rise is produced with a dissipation of 250 W. The heat lost to the environment is also L.

Suggest a type of thermometer that can be used in the experiment in Part (b).

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Other parts of this question

  1. 6(a)(i)Define the term 'Heat capacity' and state its units.[2 marks]
  2. 6(a)(ii)Define the term 'Specific heat capacity' and state its units.[2 marks]
  3. 6(a)(iii)Define the term 'Specific latent heat' and state its units.[2 marks]
  4. 6(b)(i)Deduce a value for the specific heat capacity of water.[6 marks]
  5. 6(b)(ii)Suggest ONE reason why the power, when the rate of flow of water is 10.0 g s⁻¹, is NOT twice that needed when the rate of water is 5.0 g s⁻¹.[1 mark]
  6. 6(b)(iii)State ONE advantage of using a continuous flow method for measuring the specific heat capacity of water.[1 mark]

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