Physics Worksheet - Secondary Schools - Directorate For Quality And Standards Education Page 12
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12c) The thickness of the layer of air
Heat energy
transfer
between the glass panes affects the
amount
of
heat
transfer
by
Total heat transfer
conduction and convection as shown
by convection
in the graph.
i) The graph shows that heat energy
by conduction
transfer by conduction decreases
0
0
0.5
1.0
1.5
2.0
2.5
as the thickness of air increases.
Thickness of layer of air /cm
Explain.
Figure 7
__________________________________________________________________________
_______________________________________________________________________ [2]
ii) What happens to energy transfer by convection as the thickness of air increases?
_______________________________________________________________________ [1]
iii) Give the value of the thickness of air in which there is the smallest heat energy transfer.
Explain why.
__________________________________________________________________________
_______________________________________________________________________ [2]
d) Liam and Emily find two containers of the same size but of different colour. One is black
and the other white. They want to investigate which is the best emitter of heat.
i) Draw a well labelled diagram of the apparatus used to carry out the experiment.
[2]
ii) Describe briefly the method they use.
__________________________________________________________________________
__________________________________________________________________________
_______________________________________________________________________ [3]
iii) What conclusion should Liam and Emily arrive at?
__________________________________________________________________________
_______________________________________________________________________ [1]
Page 12 of 12
Physics – Form 3 Secondary – Track 3 – 2015
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