In the emission spectrum of hydrogen the Brackett series of lines corresponds to transition of electrons from the excited states to the n₁=4 orbit. What is the wavelength of the energy line n₂=9 in the Brackett series? A) 1350 nm B) 5.50 × 10⁵ nm C) 1.09 nm D) 1820 nm E) 0.0123 m

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The Brackett series involves transitions to n1=4. Using the Rydberg formula for hydrogen, the wavelength for n2=9 to n1=4 is approximately 1820 nm.

In the Emission Spectrum of Hydrogen the Brackett Series of Lines