Q.1.
Thickness of
insulation (x)/cm
Time taken for the
temperature to fall 5.0°C/s fall (AT/At)/ Cs-1
110
0.0455
127
0.0393
149
0.0336
165
0.0303
195
0.0256
216
0.0231
a) Plot a graph of Ln ((^T/^)/ºCs-¹) (vertical axis) against (x)/cm (horizontal axis).
(15 marks)
b) Determine the slope of the graph indicating the units. (10 marks)
2.0
3.1
4.3
5.1
6.4
7.2
Rate of temperature
In((AT/At)/ Cs-¹)
-3.09
-3.24
-3.39
-3.50
-3.67
-3.77