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anonymous

  • one year ago

FAN AND MEDAL 1. In which of the following cases is the wavelength of the emitted radiation greatest? Electron jumps from third orbit to second orbit. Electron jumps from third orbit to first orbit. Electron jumps from fourth orbit to first orbit. Electron jumps from fifth orbit to second orbit.

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  1. Michele_Laino
    • one year ago
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    when electron makes a transition, between state with energy Ei to another state with energy Ef, the frequency \nu of the emitted or absorbed photon is: \[\Large h\nu = Ef - Ei\]

  2. Michele_Laino
    • one year ago
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    more precisely: \[\Large h\nu = \left| {Ef - Ei} \right|\]

  3. Michele_Laino
    • one year ago
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    since we have considered the case of absorption of a photon

  4. Michele_Laino
    • one year ago
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    now we have: \[\Large \nu = \frac{c}{\lambda }\] so we can write: \[\Large \frac{{hc}}{\lambda } = \left| {Ef - Ei} \right|\] or: \[\Large \lambda = \frac{{hc}}{{\left| {Ef - Ei} \right|}}\]

  5. Michele_Laino
    • one year ago
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    now the greatest wavelength corresponds to the smallest energy change

  6. Michele_Laino
    • one year ago
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    and the smallest energy change, happens when electron jumps the smallest number of levels

  7. anonymous
    • one year ago
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    Electron jumps from fourth orbit to first orbit.

  8. Michele_Laino
    • one year ago
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    no, since the electron makes three transitions

  9. Michele_Laino
    • one year ago
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    I think when electron makes only one transition, do you see that option?

  10. Michele_Laino
    • one year ago
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    for example in the first option the electron goes from the third level to the second one

  11. anonymous
    • one year ago
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    Whats the answer

  12. Michele_Laino
    • one year ago
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    so it makes only one transition, right?

  13. anonymous
    • one year ago
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    yeah

  14. Michele_Laino
    • one year ago
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    therefore it is the first option

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