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 Form 1 Physics heat transfer topical questions and answers

An electric heater is placed at equal distances from two similar metal cans A and B filled with water at room temperature. The outer surface of can A is shiny while that of B is dull black. State with reasons which can will be at a higher temperature after the heater is switched on for some time.

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Answer Text:
- Can B will be at higher temperature. This because a dull black surface is a good absorber of heat.