One mole of a monatomic ideal gas goes round the cycle A -> B -> C -> D -> A on a P – V diagram: A(P 0,V 0) -> B(2P 0,V 0) at constant volume, B -> C(2P 0,2V 0) at constant pressure, C -> D(P 0,2V 0) at constant volume, D -> A at constant pressure. The efficiency of the cycle is nearly

One mole of a monatomic ideal gas goes round the cycle $A \to B \to C \to D \to A$ on a $P$ – $V$ diagram: $A (P_{0}, V_{0}) \to B (2 P_{0}, V_{0})$ at constant volume, $B \to C (2 P_{0}, 2 V_{0})$ at constant pressure, $C \to D (P_{0}, 2 V_{0})$ at constant volume, $D \to A$ at constant pressure. The efficiency of the cycle is nearly

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