The head loss in a sudden expansion from 6 cm diameter pipe to 12 cm diameter pipe, in terms of velocity V1 in the smaller diameter pipe is
(a) $\frac{3}{16}\cdot \frac{V_{1}^{2}}{2g}$ (b) $\frac{5}{16}\cdot \frac{V_{1}^{2}}{2g}$
(c) $\frac{7}{16}\cdot \frac{V_{1}^{2}}{2g}$ (d) $\frac{9}{16}\cdot \frac{V_{1}^{2}}{2g}$