Internal energy change ΔU for an ideal gas depends ONLY on:
AVolume
BWork done
CPressure
DTemperature change
Answer & Solution
Correct answer: D. Temperature change
For ideal gas, U depends only on T (no intermolecular interaction). So ΔU = n Cv ΔT, regardless of path or pressure/volume changes. This is why ΔU = 0 in isothermal processes.
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