Prandtl's mixing length in turbulent flow signifies

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Prandtl's mixing length in turbulent flow signifies

1. the average distance perpendicular to the mean flow covered by the mixing particles
2. the ratio of mean free path to characteristic length of the flow field
3. the wavelength corresponding to the lowest frequency present in the flow field
4. the magnitude of turbulent kinetic energy

Correct Option: A

NA