Question

What will be the length of mercury column in a barometer tube when the atmospheric pressure is x cm of mercury and the tube is inclined at an angle `phi` with the vertical direction ?
A. `(x)/(sin phi)`
B. `(x)/(cos phi)`
C. `(x)/(tan phi)`
D. x

Answer 1

Correct Answer - B
Given, h=x cm, `theta=phi`
let, e=length of mercury column
`therefore (lamda)/(l)=sin(90^(@)-phi) implies (x)/(l)=cos phi`
`implies l=x//cos phi=x "sec" phi`