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exited electrons absorbing e.m light and emitting them? watch

    • Thread Starter

    When the electrons absorb em radiation, do they only absorb a specific frequency?
    When they emmit the em radiation, do they emitt it the smae frequency they absorbed?

    How can they 'absorb' something and then emmit it?
    Sorry :/

    I'm guessing they don't...

    Electrons will only absorb photons with the right amount of energy to move them up to a permitted energy level. Anything else will be ignored.

    They can indeed emit photons with the same energy, but it is also possible to emit photons with a smaller or larger amount of energy, so long as the electron falls to another permitted energy level. This may be the same level is started off from, but it may be one further down (if it didn;t start off in its ground state) or one further up (if the absorbed photon enabled it to "leapfrog" over one or more levels on the way up).

    And of course, all this talk of "energy" can be recast as "frequency" because of E = hf.
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