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JEE MAIN 2019
11-01-2019 S1
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
Select the correct option:
A
$\quad 2 C_p \ln \left(\frac{T_1+T_2}{4 T_1 T_2}\right)$
B
$C_p \ln \left[\frac{\left(T_1+T_2\right)^2}{4 T_1 T_2}\right]$
C
$2 \mathrm{C}_{\mathrm{p}} \ln \left[\frac{\mathrm{T}_1+\mathrm{T}_2}{2 \mathrm{~T}_1 \mathrm{~T}_2}\right]$
D
$2 C_p \ln \left[\frac{\left(T_1+T_2\right)^{\frac{1}{2}}}{T_1 T_2}\right]$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
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