Consider a hydrogen atom in a magnetic field. Sketch the possible transitions among the n = 3, l = 2 and n = 2 and l = 1 levels. Which lines will not appear if we need that Δm = 1,0, and -1 only? How many spectral lines with dissimilar frequencies will be seen in the spectrum? What will be the frequencies of these lines be if the magnetic field has magnitude B = 4 T?