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8 marksHeat Transfer

CAPE Physics Unit 1 · 2006 · Paper 2 · Question 8(a)(iii)

The thermal conductivity, k, of a material may be defined according to the expression Q/t = kA(Δθ/Δx).

State the conditions that must be satisfied before the expression may be applied.

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Other parts of this question

  1. 8(a)(i)State TWO mechanisms which enable thermal conduction to take place in a metal.[8 marks]
  2. 8(a)(ii)Explain why only one of the mechanisms is responsible for thermal conduction in an insulator.[8 marks]
  3. 8(a)(iv)Explain what is meant by the specific latent heat of vaporization of a substance.[8 marks]
  4. 8(b)Calculate the surface temperature of the hot plate, which is in contact with the pot. (Coefficient of thermal conductivity, k, for stainless steel = 50.2 W…[5 marks]
  5. 8(c)Table 3 shows the micro-voltmeter readings, V, obtained when the sphere was maintained at various temperatures and the thermopile was a distance r from it. The…[1 mark]
  6. 8(c)(i)Suggest how the intensity of radiation reaching the thermopile varies with the absolute temperature, T, of the sphere.[7 marks]
  7. 8(c)(ii)Determine the values of r₃ and V₂.[7 marks]

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