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Your attempt to explain things in terms of the way the particles move is not valid - unless you consider all the particles in the region of the experiment (e.g. You can get exactly the same interference pattern with microwaves and ultrasound waves of the same wavelength (say 3cm) where the ratio between the frequencies is around 1000. It isn't the frequency that counts - it's the wavelength and the result of the addition of all the possible paths between source and detector that produces nulls and peaks. It is due to this phenomenon that we can hear the sound of a boy standing on the other side of a wall but we cannot see him. These obstacles can be in the form of walls of a room, a table, or any other object we see around us. I'm just really struggling to imagine how a faster vibrating molecule of air diffracts less than a slower vibrating one? Diffraction of sound waves is the phenomenon of bending of this wave around obstacles. So photons with a lower frequency will have a lower momentum a lower momentum will make it "easier" to deflect.īut it's such a crude way of thinking.maybe I'm clutching at straws lol :) The only reason I can think of is a rather crude explanation by relating it to momentum of light (not sure how this would work for sound?) amplitudes the diffracted sound wave effectively only sees stagnant flow close. I'm still struggling as to why lower frequencies diffract more at a fundamental level. Diffraction DIFFRACTION The phenomenon in SOUND PROPAGATION whereby a SOUND WAVE moves around an object whose dimensions are smaller than or about equal to the WAVELENGTH of the sound. The diffraction of externally generated sound in a uniformly moving flow. I understand that now (about the corner behaving as one side of an infinitely large gap).