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This is a distant cousin to my question about the wave function of atoms in a solid. If I were to construct some apparatus that allows me to cool a bowling ball to near absolute zero, and to then cause the ball to roll through a doorway at a speed of say 10^-35 meters per second, then, since the low temp reduces atomic motion in the ball, and since the ball's speed yields a DeBroglie wavelength of macroscopic proportions, about a meter, will the ball diffract when as passes through the doorway? [?]