A vertical narrow glass tube of uniform cross-section, closed at one end has air filled in it upto 40 cm of height, with a column of mercury of height 10 cm above it….

Q: A vertical narrow glass tube of uniform cross-section, closed at one end has air filled in it upto 40 cm of height, with a column of mercury of height 10 cm above it. If the tube gradually inclined in the vertical plane and brought to a position making an angle of 600 with the vertical, then new length of air column entrapped within the tube is (atmospheric pressure = 76 cm of Hg)

(a) 45.47 cm

(b) 43 .47 cm

(c) 42.47 cm

(d) 44.47 cm

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Ans: (c)