AP EAMCET · PHYSICS · Thermodynamics
A gas is expanded from an initial state to a final state along a path that consists of (a) an isothermal expansion doing \(40 \mathrm{~J}\) work, (b) an adiabatic expansion doing \(\mathrm{W}\) work, (c) an isothermal expansion doing \(30 \mathrm{~J}\) work. If the total change in the internal energy of the gas is \(-20 \mathrm{~J}\), the work done by the gas during the adiabatic expansion \(\mathrm{W}=\)
- A \(50 \mathrm{~J}\)
- B \(90 \mathrm{~J}\)
- C \(70 \mathrm{~J}\)
- D \(20 \mathrm{~J}\)
Answer & Solution
Correct Answer
(D) \(20 \mathrm{~J}\)
Step-by-step Solution
Detailed explanation
Isothermal Expansion, In this process temperature remains constant. \(\therefore \Delta \mathrm{V}=0\) Using 1st law of thermodynamics \(\Delta \mathrm{Q}_1=\Delta \mathrm{V}_1+\Delta \mathrm{W}_1\) \(\Delta \mathrm{Q}_1=\Delta \mathrm{W}_1=40 \mathrm{~J}\) ... (1) Adiabatic…
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