The wave number of a photon in Brackett series of hydrogen atom is (9/400) R. The electron has transited from the orbit having quantum number

Q: The wave number of a photon in Brackett series of hydrogen atom is (9/400) R. The electron has transited from the orbit having quantum number

(a) 5

(b) 6

(c) 4

(d) 7

Ans: (a)