Question

A barometer tube reads 76 cm of mercury. If the tube is gradually inclined at an angle of 60^o with vertical, keeping the open end immersed in the mercury reservoir, the length of the mercury column will be

• A. 152 cm
• B. 76 cm
• C. 38 cm
• D. $38 \sqrt { 3 } \mathrm {~cm}$

Answer 1

Answer: (A)

152 cm

Answer 2

$\cos 60 ^ { \circ } = \frac { h } { l }$

⇒$l = \frac { h } { \cos 60 ^ { \circ } } = \frac { 76 } { 1 / 2 }$

∴ $l = 152 \mathrm {~cm}$