Chemistry Atomic Structure ETEA 2024
PMDC Verified Question 9 of 95
The splitting of spectral lines in magnetic field is
A
Auf-Bau principle
B
Pauli's exclusion principle
C
Stark effect
D
Zeeman effect
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Zeeman effect
Concept: The fine structure of atomic emission spectra changes when atoms are subjected to external electromagnetic fields.

Formula: None required.

Solution:
  • When an excited atom is placed in a strong magnetic field, its degenerate orbitals orient themselves differently, causing slight shifts in energy.
  • This causes a single spectral emission line to split into multiple, closely spaced lines.
  • This specific phenomenon, caused by a magnetic field, is called the Zeeman effect.


Why other options are incorrect: The Stark effect is the splitting of spectral lines in an electric field. The Aufbau and Pauli principles are rules for electron configuration, not optical phenomena.

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