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Splitting of spectral lines under the influence of magnetic field is
1) Zeenan effect
2) Zeeman effect
3) Stark effect
4) Photoelectric effect
2) Zeeman effect
The Zeeman effect is the splitting of a spectral line into two or more components of slightly different frequencies when the light source is placed in a magnetic field.
The magnetic quantum number determines the energy shift of an atomic orbital due to an external magnetic field (the Zeeman effect) — hence the name magnetic quantum number.