For an adiabatic expansion:
Correct answer: D. All of these
- A. T decreases
- B. Mechanical energy goes out of the system
- C. Q=constant
- D. All of these
Explanation
The correct answer is D because during an adiabatic expansion:A) The temperature (T) of the system decreases.B) Mechanical energy goes out of the system as the gas does work on the surroundings.C) There is no heat exchange (Q = 0).
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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