Which of the transitions in hydrogen atom emits a photon of lowest frequency ( \( n= \) quantum ...

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Which of the transitions in hydrogen atom emits a photon of lowest frequency ( \( n= \) quantum number \( ) \) ?
(A) \( n=2 \) to \( n=1 \)
(B) \( n=4 \) to \( n=3 \)
(C) \( n=3 \) to \( n=1 \)
(D) \( n=4 \) to \( n=2 \)
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