An electron has been excited from the first to the
fourth energy state in an atom. Which of the
following transitions are possible when the electron
comes back to the ground state?
(A) 4-1
(B) 4 → 2,2 → 1
(C) 4-3, 3-2, 2-1
(D) All of these
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Answer:
D) All of these
Explanation:
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