11. A Carnot engine takes 2000 J of heat from a reservoir at 500 K, does some work, and discards some heat to reservoir at 300 K. What is its efficiency?
(A) 0.2
(B) 0.3
(C) 0.4
(D) 0.5
(E) 0.6

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統計： A(4), B(0), C(54), D(0), E(2) #2016113

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49. A Carnot engine operates between two temperatures TH and TC. It takes in 600 J of heat from high-temperature reservoir at TH = 327℃ in each cycle and gives up 200 J to the low-temperature (TC) reservoir. What is the thermal efficiency of the cycle? 
(A) 67% 
(B) 33% 
(C) 75% 
(D)50%
(E)25%

 

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