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For an isothermal process, the first law of thermodynamics can be written as:

Correct answer: B. Heat absorbed = work done by the system

  • A. Heat absorbed = work done on the system
  • B. Heat absorbed = work done by the system
  • C. Heat released = work done by the system
  • D. Heat released= work done by the system+ change in internal energy

Explanation

Option A : According to the first law of thermodynamics, heat absorbed is not equal to work done on the system. Heat absorbed is equal to work done by the system. Option: B First Law of Thermodynamics: This law state that if some amount of heat is supplied to the system which is capable of doing work, then the heat absorbed by the system will be equal to the sum of the increase in internal energy and work done by the system.Option C : The heat released is equal to work done by the system is also wrong according to the first law of thermodynamics. Option D : The heat released is not equal to work done by the system and changes in internal energy according to the first law of thermodynamics.

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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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