Assuming the man has a mass of 66kg and is running at 10ms^-1
De Broglie wavelength:
λ = h / mv
= (6.63 x 10^-34) / (10 x 66)
= 1 x 10^-36 m
The gap needs to be the same size as the wavelength for diffraction to happen…In order to diffract, a person would have to run through a gap of 1 x 10^-36 m.
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