4 Fig 5.1 shows two identical metal cans, open at the top, used in an experiment on thermal
energy. The outside of can A is polished and the outside of can B is painted black
polished
Surface
black
surface
can A
can B
Fig. 5.1
(a) The cans are heated to the same temperature. Predict and explain the relative rates of
loss of thermal energy by infra-red radiation from the two cans
Canal
le
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les mehr kase
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(b) (i) A student is provided with the two cans, a supply of hot water and two thermometers.
Describe the experiment he should carry out to test your answer to (a)