JAMB Physics 1981 Question 20

Two copper calorimeters O and P have identical dimensions but the outside of O is painted black while that of P is polished. The two are fitted with lids after equal volumes of boiling water have been added to them. They are then placed separately on a large metal table at a lower temperature. Several minutes later the temperature of

1. A.both will be equal but lower
2. B.P will be higher than that of O
3. C.O will be higher than that of P
4. D.O will be unchanged
5. E.P will be unchanged.