Question

(i) Why does a bottle of soft drink cool faster when surrounded by ice cubes than by ice cold water, both at 0 °C ? 

(ii) A certain amount of heat Q will warm lg of material X by 3 °C and 1 g of material Y by 4 °C. Which material has a higher specific heat capacity ?

Answer 1

(i) Because 1 gm of ice at 0°C takes 336 J of heat energy from the drink to melt into water at 0°C. Thus drink loses an additional 336 J of heat energy for lg ice at 0°C than for 1 gm ice-cold water at 0°C. Therefore cooling produced by lg ice at 0°C is more than that by 1 gm water at 0°C.

(ii)

So meterial X has a higher specific heat capacity.