For an adiabatic process, the first law of thermodynamics can be written as:
Correct answer: A. Work done by the system = decrease in internal energy of the system
- A. Work done by the system = decrease in internal energy of the system
- B. Work done by the system = increase in internal energy of the system
- C. Work done on the system = decrease in internal energy of the system
- D. Work done on the system = decrease in internal energy of the system + heat released
Explanation
In an adiabatic process, we have no heat exchange thus the internal energy would be depending, solely, upon the work done, either on the system, or by the system.Since the situation isn't clearly stated, we have to look at all the options, midst trying to figure out which goes along the conditions. Option A refers to adiabatic expansion, where work is done by the system. As work requires energy, the system donates energy to perform work, thus resulting in a decrease in internal energy.
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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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