If the speed of pressure wave is $v_{0}$ and pipe length is L, rapid closure occurs when time of closure is -

- 1
  
  less than $\frac{2 L}{v_{0}}$
- 2
  
  greater than $\frac{2 L}{v_{0}}$
- 3
  
  less than $\frac{L}{v_{0}}$
- 4
  
  zero

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