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    An electron is incident on a hydrogen atom. (What does that mean?) As a result an electron in the ground state of the hydrogen atom is excited to level n=2 energy level. The atom then emits a photon of a characteristics frequency. Explain why the electron in the ground state becomes excited to the n=2 energy level.
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    Incident means that it hits it- you use this to say "incident photons on a metal surface" as in, "photons hitting a metal surface"

    When this collision happens, some energy is transferred from the incident electron (the electron hitting the atom) to the orbital electron in the hydrogen atom (the electron in the atom) which temporarily excites it to a higher energy level.
    You might want to mention something about how for the electron to excite upwards, it must receive energy equal to the difference between ground state and n=2? Also, the excitation is temporary because the electron will eventually de-excite and emit that photon of characteristic frequency.

    I don't know how many marks you're looking for, but I hope this helps!
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    (Original post by Kinesis)
    Incident means that it hits it- you use this to say "incident photons on a metal surface" as in, "photons hitting a metal surface"

    When this collision happens, some energy is transferred from the incident electron (the electron hitting the atom) to the orbital electron in the hydrogen atom (the electron in the atom) which temporarily excites it to a higher energy level.
    You might want to mention something about how for the electron to excite upwards, it must receive energy equal to the difference between ground state and n=2? Also, the excitation is temporary because the electron will eventually de-excite and emit that photon of characteristic frequency.

    I don't know how many marks you're looking for, but I hope this helps!
    cheers that is what I needed to know, and it was only for a 2 mark question so your information is quite sufficient.
 
 
 
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