The idealized P-V diagram above shows a complete cycle through compression and expansion of a gas. The questions below relate to the processes within the cycle.
Which letter shows isothermal compression?

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Solution

The correct option is C C
Isothermal compression means the system temperature remains constant. Here the part C represents the compression. The heat of the system will be kept constant during compression when allowing heat to escape from the system. Thus, option C will be correct.

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P - V

T_{A} = T_{B} = 400 K, λ = 1.5; (2)^{\frac{1}{3}} = 1.26)

\begin{matrix} C o l u m n I & C o l u m n I I & C o l u m n I I I (I) & Δ Q = - 247.5 R & (i) & Δ U = 165 R & (P) & Δ W = 165 R (I I) & Δ Q = 247.5 R & (i i) & Δ U = - 165 R & (Q) & Δ W = 400 R (l n 2) (I I I) & Δ Q = 400 R (l n 2) & (i i i) & Δ U = 82.5 R & (R) & Δ W = - 165 R (I V) & Δ Q = z e r o & (i v) & Δ U = z e r o & (S) & Δ W = - 82.5 R \end{matrix}

C \to A

1000 J

B \to C

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