First slide

First law of thermodynamics

Question

An ideal gas is taken through the process ABC shown in figure. Then

Moderate

A

in process AB work done by the gas is positive
B

in process AB heat is rejected
C

in process AB internal energy decreases.
D

in process BC internal energy decreases.

Solution

(2)
AB is isothermal compression process. So $Δ T = 0, Δ U = 0,$ work done by the gas is negative. Therefore from $Q = Δ U + W$ it is clear that Q is negative i.e., heat is rejected.
BC is isobaric compression process. As T decreases, internal energy also decreases.

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