Question

A barometer tube reads 76 cm of mercury. If the tube is gradually inclined at an angle of ${60}^{\circ }$ 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. C,D 38 cm

Answer 1

The correct option is A 152 cm

$Cos{60}^{\circ }=\frac{h}{I}$
$\Rightarrow I=\frac{h}{cos{60}^{\circ }}=\frac{76}{\frac{1}{2}}$
$\therefore I=152cm$