Physics Sec Sample Paper Ii A Worksheet - University Of Malta, 2012 Page 2
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111.
This question is about heat transfer and specific heat capacity.
Leo Graetz and Ernst Smidt were two German scientists who studied
heat radiation properties of solids. One instance where it is important to
reduce heat losses is in our homes. Knowing the heat properties of
solids can save energy and reduce the damage to our environment.
Leo Graetz
Ernst Smidt
Mary was given by her Physics teacher a diagram
showing the cross-section of the walls of the living room
of a house, planned to keep the transfer of heat to a
minimum.
o
o
12
C
20
C
o
(a)
The living room temperature is 20
C while that in
o
the street is 12
C. Draw an arrow on Diagram 1
to show the direction in which heat energy will be
transferred.
(1)
Diagram 1
(b)
The space between the walls is filled with polymer foam, which is a type of
plastic material with air trapped in it.
(i)
Can heat transfer take place by convection?
_____________________________________________________________________
(1)
(ii)
Explain your answer.
_____________________________________________________________________
_____________________________________________________________________
(2)
(iii)
Can heat transfer take place by conduction?
_____________________________________________________________________
(1)
(iv)
Explain your answer.
_____________________________________________________________________
_____________________________________________________________________
(2)
(v)
Use your answers to the previous questions to explain why buildings
with cavity walls insulation help to keep the cost of heating as low as
possible, especially during winter.
_____________________________________________________________________
_____________________________________________________________________
(2)
Page 2 of 11
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