A line in the Paschen series of hydrogen has a wavelength of 1280 nm. From what state did the electron originate?? i = In which region of the electromagnetic spectrum is this line observed? visible, ultraviolet, gamma rays, X‑rays, infrared, radio, microwaves.

Answer: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