NEET-XII-Physics
26: Laws of Thermodynamics
- #4Calculate the change in internal energy of a gas kept in a rigid container when 100 J of heat is supplied to it.Ans : Given: Heat supplied to the system, `` ∆``Q = 100 J
Using the first law of thermodynamics, we get
`` ∆U=∆Q-∆W``
Since the container is rigid, initial volume of the system is equal to the final volume of the system. Thus,
`` ∆``V = `` {V}_{f}-{V}_{i}``= 0
`` ∆``W = P`` ∆``V = 0
∆U = ∆Q = 100 J
We see that heat supplied to the system is used up in raising the internal energy of the system.
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