If the wave-number of a spectral line of Brackett series of hydroge...

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If the wave-number of a spectral line of Brackett series of hydrogen is \( \frac{9}{400} \) times the Rydberg constant. What is the state from which the transition has taken place ?
(A) \( n=4 \)
(B) \( n=5 \)
(C) \( n=6 \)
(D) \( n=7 \)
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