Air is contained in a piston-cylinder device. The temperature of the air is \(100^{\circ} \mathrm{C}\). Using the fact that for a reversible process the heat transfer \(q=\int T d s\), compare the amount of heat \((\mathrm{J} / \mathrm{kg})\) required to raise the temperature of the air to \(1200^{\circ} \mathrm{C}\) at

(a) constant pressure 

(b) constant volume. Verify your results using the first law of thermodynamics. Plot the processes on a Ts diagram.