A Carnot engine operating between temperatures $T_1$ and $T_2$ has efficiency $\frac {1}{6}$ . When $T_2$ is lowered by $60\,K$ ; its efficiency increases to $\frac {1}{3}$. Then $T_1$ and $T_2$ are respectively

When a system is taken from thermodynamic state $i$ to $f$ along the path $iaf$ (see figure), it is found that the heat $Q$ absorbed by the system is $50\ cal$ and work $W$ done by the system is equal to $20\ cal$ . Along the path ibf $Q = 36\ cal$ . What is $W$ along the path ibf?  ........... $\mathrm{cal}$

The $P-V$ diagram of $2\,g$ of helium gas for a certain process $A\to B$ is shown in the figure. What is the heat given to the gas during the process $A \to B$?

A Carnot engine operating between temperatures $T_1$ and $T_2$ has efficientcy $\frac{1}{6}$ . When $T_2$ is lowered by $62\,K$, its efficiency increases to $\frac{1}{3}$ . Then $T_1$ and $T_2$ are, respectively

In the cyclic process shown on the $P -V$ diagram, the magnitude of the work done is

Pressure-temperature relationship for an ideal gas undergoing adiabatic change is $\left( {\gamma  = {C_p}/{C_v}} \right)$