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(C) For an ideal gas,the internal energy $(U)$ is a function of temperature $(T)$ only,i.e.,$U = f(T)$.During an isothermal process,the temperature re

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Zero

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(C) For an ideal gas,the internal energy $(U)$ is a function of temperature $(T)$ only,i.e.,$U = f(T)$.During an isothermal process,the temperature remains constant,so $\Delta T = 0$.Since $\Delta U = nC_v\Delta T$,if $\Delta T = 0$,then $\Delta U = 0$.Therefore,the change in internal energy during the isothermal expansion of an ideal gas is zero.

During the reversible isothermal expansion of an ideal gas,the change in internal energy is......

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