Anonymous asked in Science & MathematicsPhysics · 4 months ago

chem practice?

An electron transitioning from a higher energy level down to the first energy level in a hydrogen atom emits light with a wavelength of 103 nm. Determine the energy level the electron started from before moving down to the first energy level.

Can someone explain how id do this ? 

1 Answer

  • NCS
    Lv 7
    4 months ago
    Favorite Answer

    You can find the energy of the emitted photon with

    E = hc / λ

    I get E = 1.93-18 J = 12.1 eV

    Then by Rydberg

    E = 13.6eV * (1/1² - 1/n²)

    Set them equal and solve for n.

    I get n = 3

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