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3 Conservation of energy

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Question 8

A conservation centre uses an incubator to keep reptile eggs warm. Energy is transferred by conduction through an insulating layer around the incubator.

The area of the layer and the temperature difference between its surfaces are kept constant. A designer considers:

  • increasing the thickness of the layer
  • replacing the layer with a material of lower thermal conductivity

Which option gives the effect of each change on the rate of energy transfer from the incubator?

[1]
A

Increasing the thickness: the rate decreases; using a lower thermal conductivity: the rate increases

B

Increasing the thickness: the rate increases; using a lower thermal conductivity: the rate increases

C

Increasing the thickness: the rate decreases; using a lower thermal conductivity: the rate decreases

D

Increasing the thickness: the rate increases; using a lower thermal conductivity: the rate decreases

Markscheme

3 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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