The internal energy of a system.... Select one or more: A. Always equals zero fo

Question

The internal energy of a system....

Select one or more:

A. Always equals zero for an ideal gas when its temperature is constant.

B. Consists of the kinetic and potential energies contained in the molecules of a system plus the energies contained in any fields (electric, magnetic, etc.) in the system.

C. Equals the sum of all forms of energy contained within the system.

D. Equals the heat entering the system at constant volume.

E. Equals the heat entering the system plus the work done on the system.

Explanation / Answer

Change in internal energy of a system = 0 for constant temperature process,,, It's not the internal energy =0,,, so option A is wrong.

Internal energy of a system is the energy contained within the system, excluding the kinetic energy of motion of the system as a whole and the potential energy of the system as a whole due to external force fields. Therefore option B is wrong and Option C is correct.

U = c*Cv*dT... option D is correct

By first law of thermodynamics, option E is correct.

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