1. The problem statement, all variables and given/known data Particles pass through a single slit of width 0.2 mm in a diffraction setup. The de Broglie wavelength of each particle is 633 nm. After the particles pass through the slit, they spread out over a range of angles. Use the Heisenberg uncertainty principle to determine the minimum range of angles. 2. Relevant equations Heisenberg uncertainty principle sin [tex]\theta[/tex]= [tex]\lambda[/tex]/W 3. The attempt at a solution I'm not sure exactly what a minimum range of angles mean. Is it all the possible angles through which the electrons can follow? I believe I'm stuck on how to use the uncertainty principle to find an angle. I know that the equation for diffraction through a single slit might be useful.