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  (a) Creation of an acoustic shadow by an obstruction in the path of a sound wave; (b) absence of an acoustic shadow behind an obstruction when the sound wave is of low frequency (i.e. of a wavelength large relative to the size of the obstruction). Oxford Music Online.  Retrieved 24 Jun. 2019, from https://www.oxfordmusiconline.com/view/10.1093/omo/9781561592630.001.001/omo-9781561592630-e-8000000015.