One of the reasons that quantum mechanics can seem so shocking is that quantum behavior is not readily apparent in our everyday life. as an example, assume that you are a particle of mass 65 kg. according to planck, you should have an associated wavelength. but you don't really seem to act like a wave: for example, you can pass through a doorway without diffracting. to explore whether this contradicts quantum mechanics, consider the doorway to be 1 m wide, and also consider that diffraction effects are only substantial when the wavelength is at least comparable to the width of the opening. given this, what is the largest speed at which you could pass through the doorway and experience diffraction?