# Formula for Shear stress in a turbulent flow - Fluid Mechanics

**Q. Shear stress in a turbulent flow is given by the formula **

τ = η (du / dy)

Where η (eta) is, *- Published on 05 Aug 15***a.** eddy viscosity

**b.** apparent viscosity

**c.** virtual viscosity

**d.** all of the above

**ANSWER: all of the above**