## University Physics with Modern Physics (14th Edition)

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.