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CSE · Paper II · Atomic & Molecularcse-2001-subject-06-001

Lamb shift — UPSC Physics Optional CSE 2001 Paper II

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(i) What is Lamb shift? Explain it by illustrating through a suitable energy level diagram. Has Lamb shift been observed in any atom other than hydrogen? (ii) How does the 21 cm hydrogen line originate? Comment on its astronomical applications.

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