Three lawn chairs, one made up of aluminium (heat capacity = 0.90 J/K-g), one of iron (heat capacity = 0.45 J/K-g) and one of tin (heat capacity = 0.60 J/K-g) are painted of the same colour. On a sunn

Question

Three lawn chairs, one made up of aluminium (heat capacity = 0.90 J/K-g), one of iron (heat capacity = 0.45 J/K-g) and one of tin (heat capacity = 0.60 J/K-g) are painted of the same colour. On a sunny day which chair will be hotter to sit?

TestHub · Accepted Answer

Same colour and same exposure means each chair absorbs heat at the same rate per unit mass. Δ T = q/(m c), so for equal heat per gram the temperature rise is inversely proportional to the specific heat. Iron has the smallest value (0.45 J/K-g), so it warms most and is hottest. Matches (a).

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