A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
A.2AH1−−−√Cd×a2g−−√
2AH1Cd×a2g
B.2AH2−−−√Cd×a2g−−√
2AH2Cd×a2g
C.2A(H1−−−√−H2−−−√)Cd×a2g−−√
2A(H1−H2)Cd×a2g
D.2A(H321−H322)Cd×a2g−−√
Answer: Option C