Q. If ΔU and ΔW represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?
A) ΔU = −ΔW, in an isothermal process
B) ΔU = −ΔW, in an adiabatic process
C) ΔU = ΔW, in an isothermal process
D) ΔU = ΔW, in an adiabatic process
Explanation
[Solution from source] First law: Q = ΔU + ΔW with ΔW the work done by the system. In an adiabatic process Q = 0, so ΔU = −ΔW. In an isothermal process of an ideal gas ΔU = 0, so neither isothermal relation holds. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.