A) the kinetic energies of all the molecules of A and B will be equal
B) the potential energies of all the molecules of A and B will be equal
C) the internal energies of the two bodies will be equal
D) the average kinetic energy of the molecules of two bodies will be equal
Correct Answer: C
Solution :
When bodies are in thermal equilibrium, the temperature remains constant. Since, internal energy is a function of temperature \[(\Delta T)\], \[\left( \Delta U=\frac{1}{2}f\Delta T \right)\], hence for isothermal change\[\Delta T=0\], therefore \[\Delta U=0\] Hence, internal energies of the two bodies will be equal.
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