Thermal radiation and energy balance

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Question 22
Easy

Two identical hollow copper spheres are filled with the same volume of hot oil at an initial temperature of $150\ ^\circ\text{C}$.

  • Sphere A has a rough, matte black outer surface.
  • Sphere B has a highly polished, shiny chrome outer surface.

Both spheres are allowed to cool under identical conditions in a laboratory maintained at a constant room temperature of $20\ ^\circ\text{C}$.

The cooling curve for Sphere A is plotted on the grid below.

Figure 1: Cooling curve for Sphere A

State how the cooling curve for Sphere B would differ from the curve shown for Sphere A.

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Thermal radiation and energy balance Questions

  1. GCSE
  2. /Physics
  3. /Thermal radiation and energy balance