In a certain Stern-Gerlach experiment a bean of potassium atoms (mass: M=6.4673x10^-26 kg) emerges from an oven at a temperature of 150 C. That means that each potassium atom has a kinetic energy of 8.76x10^-21 J. The atoms pass through an inhomogeneous magnetic field, whose gradient is 1.2x10^2 T/cm for a distance of 2.0 cm, and continue through a free-field space of 10.0 cm before being deposited on a collector plate. What is the maximum distance between the two lines at the detector? I'm not sure what is involved. I think my main problem is the picture. What two lines at the detector is the problem refering two? Right now I just can't focus I guess.