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RE: Why do we not diffract if we run through an open doorway?
I googled it: https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Quantum_Mechanics/02._Fundamental_Concepts_of_Quantum_Mechanics/De_Broglie_Wavelength
and used 60 Kg as the mass and 0.5 meters/second as the velocity ...