Question

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If $T_i$ is the initial temperature and $T_f$ is the final temperature, which of the following statements is correct ?

• A. $\left(T_{f}\right)_{irrev} > \left(T_{f}\right)_{rev}$
• B. $T_f > T_i$ for reversible process but $T_f = T_i$ for irreversible process
• C. $\left(T_{f}\right)_{rev} > \left(T_{f}\right)_{irrev}$
• D. $T_f = T_i$ for both reversible and irreversible processes

Answer 1

Answer: (A)

$\left(T_{f}\right)_{irrev} > \left(T_{f}\right)_{rev}$

Answer 2

$T _{f\,\left(irreversible\right)} > T_{f\,\left(reversible\right)}$ It is an adiabatic expansion and W (rev) is maximum.