An ideal monoatomic gas occupies volume `10^(-3)m^(3)` at temperature `3K` and pressure `10^(3)`Pa. The internal energy of the gas is taken to be zero at this point. It undergoes the following cycle: The temperature is raised to `300K` at constant volume, the gas is then expanded adiabatically till the temperature is `3K` , followed by isothermal compression to the original volume . Plot the process on a `PV` diagram. Calculate (i) The work done and the heat transferred in each process and the internal energy at the end of each process, (ii) The thermal efficiency of the cycle.