Question:
Two blocks of the same metal having same mass and at temperature $T_{1}$ and $T_{2}$, respectively. are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure. The change in entropy, $\Delta \mathrm{S}$, for this process is :
Correct Option: , 3
Solution:
$\mathrm{C}_{\mathrm{P}} \ln \left[\frac{\left(\mathrm{T}_{1}+\mathrm{T}_{2}\right)^{2}}{4 \mathrm{~T}_{1} \mathrm{~T}_{2}}\right]$