Define Critical Frequency?

1.	Define Critical Frequency?
Answer» For any layer, the HIGHEST frequency that will be REFLECTED back for VERTICAL incidence is fcr = 9 √Nmax For any layer, the highest frequency that will be reflected back for vertical incidence is fcr = 9 √Nmax

Answer»

For any layer, the HIGHEST frequency that will be REFLECTED back for VERTICAL incidence is

fcr = 9 √Nmax

For any layer, the highest frequency that will be reflected back for vertical incidence is

fcr = 9 √Nmax

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