# The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

A. Q = (2/3) Cd × b × √(2g) × (H2 - H1)

B. Q = (2/3) Cd × b × √(2g) × (H2 ^{1/2} - H1 ^{1/2})

C. Q = (2/3) Cd × b × √(2g) × (H2 ^{3/2} - H1 ^{3/2})

D. Q = (2/3) Cd × b × √(2g) × (H2 ^{2} - H1 ^{2})