In the Zeeman effect, the energy levels of hydrogen are split by a magnetic field. Each state with a different value of m_l has a different energy. The differences in energy between adjacent values of m_l are all equal. The Zeeman effect is observed as a splitting in the spectral lines of hydrogen in the presence of a magnetic field. What is the greatest number of lines that a single spectral line can be split into by a magnetic field? a)2 b)3 c)4 d)5 e)6