Correct Answer: Zeeman Effect
Subject: chemistry
Explanation: • <b>Key Fact</b> The splitting of spectral lines in an external magnetic field is called the Zeeman Effect. • <b>Supporting Detail</b> Bohr's Atomic Model failed to explain the Zeeman Effect. • <b>Related Concept</b> The splitting of spectral lines in an electric field is called the Stark Effect. • <b>Why wrong options are wrong</b> Stark effect involves electric fields. Photoelectric effect involves light-induced electron emission. • <b>Exam Trick</b> Magnetic field = Zeeman Effect. Electric field = Stark Effect. • <b>Additional Info</b> Magnetic quantum number (m_l) was introduced to explain the Zeeman effect.
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