Which of the following is a dimensionally homogeneous equation ?

- 1
  
  $V = \frac{1}{n} R^{2 / 3} S^{1 / 2}$ (Manning's equation)
- 2
  
  $V = C \sqrt{R S}$ (Chezy's equation)
- 3
  
  $ρ = \frac{32 μ V L}{D^{2}}$ (Laminar flow in pipes)
- 4
  
  $N_{s} = \frac{N \sqrt{P}}{H^{3 / 4}}$ (specific speed of a turbine)

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