1. The problem statement, all variables and given/known data Can wave-like behaviour, eg interference or diffraction, be observed with the following? Electrons with a velocity of 20 m/s passing through a double slit with a separation of 2nm 2. Relevant equations 3. The attempt at a solution The solution is given in the book. λ = 2.65 x 10^-35 m Then it states this is too large to show interference or diffraction. But what I'm wondering is, if the double slit separation distance and the wavelength measurement is known, can one simply know straight away that there is no interference or diffraction if the double slit separation distance is smaller than the wavelength. As is the case here.