MHT CET · Physics · Thermodynamics

A monoatomic gas \(\left(y=\frac{5}{3}\right)\) initially at \(27^{\circ} \mathrm{C}\) having volume \(V\) is suddenly compressed to one-eight of its original volume \(\left(\frac{V}{8}\right)\). After the compression temperature becomes.

A \(1160 \mathrm{~K}\)
B \(580 \mathrm{~K}\)
C \(1200 \mathrm{~K}\)
D \(927 \mathrm{~K}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(1200 \mathrm{~K}\)

Step-by-step Solution

Detailed explanation

The change in volume is sudden so, we have to consider adiabatic compression:
\(T_1 V_1^{\gamma-1}=T_2 V_2^{\gamma-1}\)
\(T_2=T_1\left(\frac{V_1}{V_2}\right)^{Y-1}=(273 \mathrm{~K}+27 \mathrm{~K})\left(\frac{8 V}{V_2}\right)^{\frac{5}{3}-1}=\) \(4 \times 300 \mathrm{~K}=1200 \mathrm{~K}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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