While we have learned about this equation using electrons, pions, protons and neutrons, it can be used for any type of matter. So, you might wonder why we do not see wave effects for large objects - like humans.
We can begin to understand the answer to this by repeating the experiments we did previously focusing on objects with different masses.
Start the Double Slit program and collect interference patterns for Pions, Neutrons, and finally Protons. (Recall a pion has a mass 300 times that of the electron while the neutron and proton masses are about 2,000 times that of the electron.) Now, investigate how the patterns change as the separation between slits changes. Pick one particle and one energy; change the slit separation to answer the following.
How does the pattern change as the slit separation increases? What does this mean for large objects? Comment on the de Broglie wavelength for large objects and the subsequent slit separation required to view the interference pattern.
For patterns to be formed, the separation between the slits must be comparable to the wavelength of the waves passing through them. Thus, as your separation became very large, the pattern was not easy to see.