A liquid of density $ρ$ and bulk modulus K flows with a mean velocity V in a long rigid pipe of diameter D. A sudden closure of a valve at the end of the pipe produces a maximum water hammer head $h_{w}$ , which is equal to

- 1
  
  $\frac{V \sqrt{ρ}}{g \sqrt{K}}$
- 2
  
  $\frac{V \sqrt{K}}{g \sqrt{ρ}}$
- 3
  
  $\frac{V \sqrt{g}}{ρ \sqrt{K}}$
- 4
  
  $\frac{V ρ}{\sqrt{g K}}$

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