Aline in the paschen series of hydrogen has a wavelength of 1280 nm. from what state did the electron originate? = in which region of the electromagnetic spectrum is this line observed? visible, ultraviolet, gamma rays, x‑rays, infrared, radio, microwaves.

Electron was originate from n=5

line observed i infrared region

Explanation:

c= νλ(where ‘c’ is the velocity, ‘ν’ is the frequency and ‘λ’ is the wavelength

v = 3x10^8/1280x10^-9

v=  0.000234375hz

ν⁻(wave umber)=1/λ

                          = 1/1280x10-⁷

                          -= 7812.50cm⁻¹

wave no= R( 1/n₁  - 1/ n₂)

7812.5   = 109678( 1/3²- 1/n₂²)

7812.5/ 109678= (0.111 - 1/n₂²)

0.07-0.111 =  -1/n₂²

-0.041       = -1/n₂²

 n₂²          =   24.39

                =  4.93  ≅5

Electron was originate from n=5

line observed i infrared region

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