In which process is the net work done zero?
Correct answer: B. Free expansion
- A. Cyclic
- B. Free expansion
- C. Isobaric
- D. Adiabatic
Explanation
The net work done is zero in a free expansion process.In a free expansion, the gas expands into a vacuum. There is no external pressure opposing the expansion, so the gas does no work. The work done by a gas is equal to the pressure multiplied by the change in volume. Since there is no external pressure in a free expansion, the work done is zero.
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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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