> When the article says [...] they are speaking of power Who knows what they are speaking of, it's a very poorly written article. > The distance between the r

> When the article says [...] they are speaking of power Who knows what they are speaking of, it's a very poorly written article. > The distance between the ridges are roughly equivalent to the wavelength of the airport noise, which is about 36 feet. What. The airport noise is broadband noise, it doesn't have a definite wavelength. 36 feet means a frequency of 31Hz. 31Hz is not even the dominant frequency[1]... [1] https://www.ndt.net/article/jae/papers/26-290.pdf https://www.ndt.net/article/jae/papers/26-290.pdf