$A$ closed pipe containing liquid showed a pressure $P_{1}$ by gauge. When the valve is opened,the pressure was reduced to $P_{2}$. The speed of water flowing out of the pipe is $[\rho = \text{density of water}]$
- A$\left[\frac{2(P_{1}+P_{2})}{\rho}\right]^{1/2}$
- B$\left[\frac{2(P_{1}-P_{2})}{\rho}\right]^{1/2}$
- C$\left[\frac{\rho}{2(P_{1}-P_{2})}\right]^{1/2}$
- D$\left[\frac{\rho}{2(P_{1}+P_{2})}\right]^{1/2}$
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