1.

In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen               [AIEEE 2003]

A.                 3 ® 2
B.                 5 ® 2
C.                 4 ® 1   
D.                 2 ® 5
Answer» B.                 5 ® 2


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