Considering that $\frac{P}{ρ^{k}}$ = constant expresses an isentropic process, which one of the following is not a representation of speed of a sound wave ?

(Symbols have the usual meaning)

- 1
  
  $\sqrt{k g R T}$
- 2
  
  $\sqrt{\frac{d p}{d ρ}}$
- 3
  
  $\sqrt{\frac{K}{ρ}}$
- 4
  
  $\sqrt{\frac{p}{ρ}}$

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