A fixed mass of gas undergoes isochoric (isovolumetric) change. As a result, the pressure of the gas has increased. Which of the following is true about the gas?
Correct answer: D. Internal energy = increase direction of transfer of thermal energy= heat absorbed by the gas
- A. Internal energy = decrease direction of kinetic energy = heat released from the gas
- B. Internal energy = decrease direction of transfer of thermal energy = heat absorbed by the gas
- C. Internal energy = increase direction of transfer of thermal energy = heat released by the gas
- D. Internal energy = increase direction of transfer of thermal energy= heat absorbed by the gas
Explanation
In isovolumetric change, volume doesn't change so no work can be done so heat can only be transferred in the form of thermal energy and heat must be absorbed by the gas so Option D will be the correct answer.
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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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