My initial understanding of the double-slit experiment was that the resulting interference pattern demonstrated that particles such as electrons behaved like a wave. However, if one of the slits was covered, then they reverted to their particle-like nature. However, the single-slit experiment also shows a wave-like probability distribution with a central peak an nulls on either side. Many references cite wave defraction claculations to determine the nature of this pattern. Thus, the double-slit experiment shows that electrons behave like waves and if one slit is covered you get a single-slit defration pattern that also behaves like a wave. 1) How do these experiments show that an electron behaves like a particle? 2) What's the purpose of the double slit experiment if the single slit experiment shows the wave-like nature of electrons?