Which of the following equation gives actual discharge through a venturimeter?
(where a1 and a2 are the cross sectional areas at the inlet section and throat of the venturimeter; g is the acceleration due to gravity, H is the venturihead: and Cd is the coefficient of discharge.)
1
\(C_d \frac{a_1 a_2 \sqrt{2gH}}{\sqrt{a_1^2 - a_2^2}}\)
2
\( \frac{a_1 a_2 \sqrt{2gH}}{\sqrt{a_1^2 - a_2^2}}\)
3
\(C_d \frac{a_1 a_2 \sqrt{2gH}}{\sqrt{a_1^2 + a_2^2}}\)
4
\( \frac{a_1 a_2 \sqrt{2gH}}{2\sqrt{a_1^2 + a_2^2}}\)