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Question

In Bohr series of lines of hydrogen spectrum, third line from the red end corresponds to which one of the following inner orbit jumps of electron for Bohr's orbit in atom of hydrogen

A
41
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B
25
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C
32
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D
52
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Solution

The correct option is A 52
We see red end means it is a part of the visible region and obviously only Balmer series corresponds to the visible region for the Balmer series n1=2 and red end means low energy or third end from this means n2=5
2(r)5.3
2(r)4.2
2(r)3.1
The correct answer is (D) 52

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