The Brackett series in the hydrogen emission spectrum corresponds to electronic transitions from higher energy levels to the fourth energy level. The lowest energy light in the Brackett series is emitted when the electron transitions from the fifth energy level to the fourth energy level.
The electronic transitions resulting with the electron in the fourth orbit make up the Brackett series of lines in the emission spectrum of hydrogen. The Brackett series corresponds to the transitions from higher energy levels (n=4, 5, 6,...) to the fourth energy level (n=4).
The lowest energy light in the Brackett series is emitted when the electron transitions from the fifth energy level (n=5) to the fourth energy level (n=4).
The highest energy light is emitted when the electron transitions from the fourth energy level (n=4) to the sixth energy level (n=6).
The wavelength of the lowest energy light in the Brackett series can be calculated using the Rydberg formula:
1/λ = RH(1/42 - 1/52)
The wavelength of the highest energy light in the Brackett series can be calculated using the Rydberg formula:
1/λ = RH(1/42 - 1/62)
Learn more about Hydrogen Emission Spectrum