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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)
(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)