Topic: Isothermal and adiabatic processes· Thermodynamics

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened.…

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is :

1. isothermal

2. adiabatic

3. isochoric

4. isobaric

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Answer: 2. adiabatic

The system is thermally insulated, so no heat enters or leaves: \(Q=0\). That makes the process adiabatic.

(This is a free expansion: the gas does no work, so for an ideal gas the final temperature equals the initial one. Still, the process is called adiabatic because no heat is exchanged. It is not isochoric or isobaric, since the volume and pressure both change.)

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Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened.…

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