using the illustration when both surfaces 1 and 2 are exposed to the atmoshere, `P_1` and `P_2` are gauge pressure , and `h_1` and `h_2` are heights .

The Bernoulli equation for this situation is `h_1+P_1 /W+V_1^2/"2a"=h_2+P_2/W+V_2^2/"2a"`
The value of `P_1` and `P_2` are such that

Options

A. `P_1 = P_2 = 0 `
B. `P_2` lt `P_1 `
C. `P_1 gt P_2`
D. `P_1// P_2 = 0`

Answer

A

Explanation

Since pressure is measured in gauge , pressure and `P_1` and `P_2` are measured at surfaces exposed to the atmosphere `P_1=P_2 =0`