The specific speed of a turbine is given by the equation:

A

$$\frac{N \sqrt{P}}{H^2}$$

B

$$\frac{N \sqrt{P}}{H^{\frac{3}{2}}}$$

C

$$\frac{N \sqrt{P}}{H^{\frac{5}{4}}}$$

D

$$\frac{N \sqrt{P}}{H^{3}}$$