For a typical steel framed 30 ft by 30 ft office building bay, the fre-quency will be in the 5-8 Hz range. Frequency is a function of span (the longer the span, the lower the frequen-cy) and weight supported (the heavier the floor and the supported contents, the lower the frequency).
Anxiety doesn't appear to cause any dramatic changes to your skin color. You're not going to turn blue or purple. But some degree of skin color change is normal with anxiety and stress, especially under extreme anxiety like during a panic attack.
Most significant factor in skin color. Produced by melanocytes in the stratum basale. Two forms: eumelanin=brownish black and pheomelanin= A reddish yellow sulfur containing pigment these determine the different shades of skin. People of different skin colors have the same number of melanocytes.