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Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at \( T_{0} \), while box \( B \) contains one mole of He at \( 7 / 3 T_{0} \). The boxes are then put into thermal contact with eachother, and heat flows between them till the gases reach a common final temperature \( T_{f} \). Ignore the heat capacity of boxes. Then \( T_{f} \) in terms of \( T_{0} \) is
(A) \( T_{f}=\frac{7}{3} T_{0} \)
(B) \( T_{f}=\frac{3}{2} T_{0} \)
(C) \( T_{f}=\frac{5}{2} T_{0} \)
(D) \( T_{f}=\frac{3}{7} T_{0} \)
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