The three water filled tanks shown have the same volume and height. If small identical holes are punched near this bottom, which one will be the first to get empty.
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The time to empty depends on the initial flow rate, which is determined by Torricelli's law: , where h is the height of the water column. All three tanks have the same initial height h, so the initial velocity is identical. However, the cross-sectional area at the top (A_top) affects how quickly the water level drops. A smaller A_top means the water level falls faster for the same flow rate from the hole. Tank (ii) has the smallest top area, so its water level will drop the fastest, making it empty first.
Final Answer: (ii)