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?

An electron has been excited from the first to the fourth energy state

1.	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.	\[4\to 1\]
B.	\[4\to 2,2\to 1\]
C.	\[4\to 3,3\to 2,2\to 1\]
D.	All of the above
Answer» E.

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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?

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