複選題

30 One mole of ideal monatomic gas is taken around the reversible cycle of Fig. 25. The isothermals are at 500K and 300K. (R is the gas constant

(A)Q₁=500Rln2
(B)Q₂=-300R
(C)Q₃=-300Rln2
(D)the work done in one cycle is 200Rln2
(E)the efficiency of the engine is 0.214

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