The ratio of the coefficient of friction drag in laminar boundary layer compared to that in turbulent boundary layer is proportional to

- 1
  
  ${R_{L}}^{1 / 2}$
- 2
  
  ${R_{L}}^{1 / 5}$
- 3
  
  ${R_{L}}^{3 / 10}$
- 4
  
  ${R_{L}}^{- 3 / 10}$

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