Question

Consider the following statements pertaining to boundary layer on a flat plate:                               

1. The thickness of laminar boundary layer at a distance x from the leading edge varies as x^1/2.

2. The thickness of turbulent boundary layer at a distance x from the leading edge varies as x^4/5.

3. Boundary layer is laminar when Reynolds number is less than 5 x 10⁵

Which of the above statements are correct?

     (a) 1, 2 and 3        (b) 1 and 2 only

     (c) 1 and 3 only     d) 2 and 3 only