JEE Mains · Physics · STD 11 - 11. thermodynamics
Heat is given to an ideal gas in an isothermal process. \(A.\) Internal energy of the gas will decrease. \(B.\) Internal energy of the gas will increase. \(C.\) Internal energy of the gas will not change. \(D.\) The gas will do positive work. \(E.\) The gas will do negative work. Choose the correct answer from the options given below :
- A \(A\) and \(E\) only
- B \(B\) and \(D\) only
- C \(B\) and \(D\) only
- D \(C\) and \(D\) only
Answer & Solution
Correct Answer
(D) \(C\) and \(D\) only
Step-by-step Solution
Detailed explanation
\(dQ = dU + dW \Rightarrow dU = nC _{ V } dT\) \(dU =0 \quad \text { (for isothermal) }\) \(U =\text { constant }\) \(Also dQ > 0 \quad \text { (supplied) }\) Hence,\(dW > 0\)
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