(chatquestion)...meter long narrow tube held horizontally (and closed at one end) contains a 76 cm long mercury thread which trans a 15 cm column of air. When the tube is held verticallly with the open end at the bottom, the length of mercury that flows out is (A) 20.2 cm (B) 23.8 cm (C) 25. 6 cm (D) 32. 1 cm

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