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The frequency corresponding to transition n= 2 to n =1 in hydrogen atom is:
(1) 15.66 x 1010 Hz
(2) 24.66 x 10 14 Hz
(3) 30.57x 10 14 Hz
(4) 40.57 x 10 24 Hz
Ans: 24.66 x 10 14 Hz
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