Final answer:
Turbulence between 600,000 and 700,000 Reynolds number has a medium severity. Option 2.
Step-by-step explanation:
In physics, turbulence is a state of fluid flow characterized by chaotic changes in velocity and pressure. The severity of turbulence is often measured using the Reynolds number, which takes into account the size and velocity of the object in the flow. Between 600,000 and 700,000 Reynolds number, turbulence is generally considered to have a medium severity. Option 2.