In the early 1900s the normal Zeeman effect was useful to determine the electron’s e/m if Planck’s constant was assumed known. Calcium is an element that exhibits the normal Zeeman effect to a good approximation. The difference between adjacent components of the spectral lines is observed to be 0.0168 nm for λ = 422.7 nm when calcium is placed in a magnetic field of 1.5 T. From these data calculate the value of e h / 2π m and compare with the accepted value today. Calculate e/m using this experimental result along with the known value of h-bar.
