I am studying the application of a Blocking mass and Interlayer when placed between to semi-infinite beams or plates,having bending wave propagation,in terms of noise transmission.My question is based on a conclusion I found in the literature.It says for the blocking mass or the interlayer to work its length should be of the order of sixth of the wavelength of the bending waves passing through the block .I am looking for the reason behind relation between the length and the wavelength.
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