Chapter 20, Problem 4Q

An ideal monatomic gas at initial temperature T₀ (in kelvins) expands from initial volume V₀ to volume 2V₀ by each of the five processes indicated in the T-V diagram of Fig. 20-20. In which process is the expansion (a) isothermal, (b) isobaric (constant pressure), and (c) adiabatic? Explain your answers. (d) In which processes does the entropy of the gas decrease?

Figure 20-20 Question 4.