In Balmer series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?

Options

A. `3rarr2`
B. `5rarr2`
C. `4rarr1`
D. `2rarr5`

Answer

B

Explanation

The electron has minimum energy in the first orbit and its energy increases as n increases. Here n represents number of orbit, i.e. `1^("st"), 2^("nd"), 3^("rd")`…. The third line from the red end corresponds to yellow region i.e., 5. In order to obtain less energy electron tends to come in `1^("st") or 2^("nd")` orbita. So jump involved may be either `5rarr1" or "5rarr2.`