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In Boh'r series of lines of hydrogen spe...

In Boh'r series of lines of hydrogen spectrum, the third line from the red corresponds to which one of the following inter orbit jumps of the electron for Boh'r orbit in an atom of hydrogen ?

A

`3 rarr 2`

B

`5 rarr 2`

C

`4 rarr 1`

D

`2 rarr 5`

Text Solution

Verified by Experts

The correct Answer is:
B
Third line from the red end means it is in the visible region. Only Balmer series has line spectrum in visible region. That means electron will jump from a higher orbit to `2^(nd)` orbit. (So options cand d are not possible). Red end of the visible region corresponds to the lowest energy transmission `(E prop1//lamda)`.
The lowest energy will be emitted from `3 rarr 2`. So `4 rarr 2` will be the second line from red end and `5rarr2` will be the third line from red end.
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