Answer
See explanation.
Work Step by Step
a. Find the speed for you to have a 1-meter wavelength.
$\lambda=\frac{h}{p}=\frac{h}{mv}$
$v =\frac{h}{m \lambda }=
\frac{6.626\times10^{-34}J \cdot s}{(60kg)(1.0m)}= 1.1\times10^{-35}m/s $
b. $t=\frac{0.80m}{v}=7.24\times10^{34}s=2.3\times10^{27}y$
You take just a few seconds to walk through a doorway. You will not experience diffraction effects.
