a isothermal processes are necessarily slow as they require heat transfer to remain at the same temperature which is done by being in thermal equilibrium with some reservoir. $A$ process will be isothermal only if it happens on timescales larger than the timescale required for effective heat transfer.
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One mole of an ideal gas expands adiabatically from an initial state $\left(T_A, V_0\right)$ to final state $\left(T_f, 5 V_0\right)$. Another mole of the same gas expands isothermally from a different initial state ( $T_{\mathrm{B}}, \mathrm{V}_0$ ) to the same final state $\left(T_{\mathrm{f}}, 5 V_0\right)$. The ratio of the specific heats at constant pressure and constant volume of this ideal gas is $\gamma$. What is the ratio $T_{\mathrm{A}} / T_{\mathrm{B}}$ ?
A closed container is fully insulated from outside. One half of it is filled with an ideal gas $X$ separated by a plate Pfrom the other half $Y$ which contains a vacuum as shown in figure. When $P$ is removed, $X$ moves into $Y$. Which of the following statements is correct?
A Carnot engine whose sink is at $300\, K$ has an efficiency of $40\%.$ By how much should the temperature of source be increased so as to increase its efficiency by $50\%$ of original efficiency ..... $K$
Two kg of water is converted into steam by boiling at atmospheric pressure. The volume changes from $2 \times {10^{ - 3}}\,{m^3}$ to $3.34{m^3}.$ The work done by the system is about ....... $kJ$