Preliminary calculations for a hydroelectric power generation site show a net head of \(2350 \mathrm{ft}\) is available at a water flow rate of \(75 \mathrm{ft}^{3} / \mathrm{s}\). Compare the geometry and efficiency of Pelton wheels designed to run at

(a) \(450 \mathrm{rpm}\) 

(b) \(600 \mathrm{rpm}\).