Heat And Thermo Dynamics

Question

The process AB is shown in the diagram. As the gas is taken from A to B, its temperature    (A) initially increases then decreases                                                                                        (B) initially decreases then increases                                                                                    (C) remains constant                                                                                                                (D) variation depends on type of gas                                                                                            PLEASE EXPLAIN

Comments

Answer would be option (A) initially increases then decreases.

Answer 1

Let us first find the equation of the straight line,

∴ equation of the line :  P = V × (−p​/v) + 2p

We know that internal Energy (U) = PV

As we go from point A to point B volume increases .
As volume increases internal energy initially increases and then decreases, since the internal energy as a function of volume is a downward parabola.