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5 marksHeat Transfer

CAPE Physics Unit 1 · May/June 2021 · Paper 2 · Question 3(c)(iii)

A metal sphere of surface area A radiates power P in an oven at temperature T. Values are recorded in Table 2.

Determine the gradient of the graph plotted on page 17 and hence deduce the surface area of the metal sphere.

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Other parts of this question

  1. 3(a)State three assumptions of the kinetic theory of ideal gases.[3 marks]
  2. 3(b)(i)Calculate the average translational kinetic energy of one molecule of Ne gas.[3 marks]
  3. 3(b)(ii)Calculate the number of molecules of Ne gas in the metal sphere.[3 marks]
  4. 3(b)(iii)Calculate the root mean square (r.m.s.) speed of the Ne molecules.[4 marks]
  5. 3(c)(i)Complete Row 3 of Table 2 by calculating and filling in the values for T⁴ / K⁴ (×10⁹).[1 mark]
  6. 3(c)(ii)On the grid provided in Figure 5 on page 17, plot a graph of P versus T⁴. Draw the line of best fit through the points.[4 marks]
  7. 3(d)Describe the mechanism of thermal conduction in metallic conductors.[7 marks]

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