51. A hot object at temperature 500 K is moved to contact with a cool object at 300 K, and a heat of 50 kJ flows irreversibly from one to the other. Assume that neighter object changes its temperature. How much is the entropy of the universe changed?
(A) 1000 J/K
(B) 40 MJ/K
(C) 66.7 J/K
(D) 62.5 J/K
(E) none of the above
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統計: A(0), B(0), C(3), D(0), E(0) #3421246
統計: A(0), B(0), C(3), D(0), E(0) #3421246