If a centrifugal pump has an impeller speed of $N$ (in rpm). discharge $Q$ (in $\mathrm{m}^{3} / \mathrm{s}$ ) and the total head $H$ (in $\mathrm{m}$ ), the expression for the specific speed $N_{s}$ of the pump is given by
(A) $N_{S}=\frac{N Q^{0.5}}{H^{0.5}}$
(B) $N_{S}=\frac{N Q^{0.5}}{H}$
(C) $N_{S}=\frac{N Q^{0.5}}{H^{0.75}}$
(D) $N_{S}=\frac{N Q}{H^{0.75}}$
If a centrifugal pump has an impeller speed of $N$ (in rpm). discharge $Q$ (in $\mathrm{m}^{3} / \mathrm{s}$ ) and the total head $H$ (in $\mathrm{m}$ ), the expression for the specific speed $N_{s}$ of the pump is given by
(A) $N_{S}=\frac{N Q^{0.5}}{H^{0.5}}$
(B) $N_{S}=\frac{N Q^{0.5}}{H}$
(C) $N_{S}=\frac{N Q^{0.5}}{H^{0.75}}$
(D) $N_{S}=\frac{N Q}{H^{0.75}}$