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27 April, 17:28

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.

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  1. 27 April, 17:37
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    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
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