NEETPhysicsThermodynamics
Pressure ( P ) versus density (d) graph of an ideal gas is shown in the figure. Choose the correct statement.
Options
- ADuring the process AB , workdone by the gas is positive
- BDuring the process AB , workdone by the gas is negative
- CDuring the process B C , internal energy of the gas increases
- DDuring the process DA, internal energy of the gas remains constant
Correct answer
D. During the process DA, internal energy of the gas remains constant
Step-by-step solution
- Graph is P vs density (d). - From ideal gas law: (P= R T M ). At constant temperature (T), (P ) straight line through origin. - Line DA is parallel to (P d ), hence isothermal process. - In an isothermal process, temperature remains constant, so internal energy ((U)= ) constant. Thus, the correct statement is (4).