Catarina, MEMBER 17, Portugal 428 poäng (JäRN)		June 22, 2010 14:05 Reminding what I learned in class, I think that free electrons aren't "attracted" to anything, and so they can absorb all frequencies and turn it into their own kinetic energy… On the other hand, electrons that orbit around a nucleus are attracted to it. That means they need energy to free themselves from that nucleus. Since the electrons orbit in "defined levels", as you go from the 1st level to the 3rd level, for instance, the force that attracts the electrons to the nucleus decreases, and therefore the amount of energy needed to remove that electron is also smaller. As I said before, the electrons orbit in defined levels. Being so, the energy needed to excite an electron or to remove it is also in a well-defined frequency. I think that's why non-free electrons don't absorb all frequencies… Did I answer your question??
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Reminding what I learned in class, I think that free electrons aren't "attracted" to anything, and so they can absorb all frequencies and turn it into their own kinetic energy… On the other hand, electrons that orbit around a nucleus are attracted to it. That means they need energy to free themselves from that nucleus. Since the electrons orbit in "defined levels", as you go from the 1st level to the 3rd level, for instance, the force that attracts the electrons to the nucleus decreases, and therefore the amount of energy needed to remove that electron is also smaller. As I said before, the electrons orbit in defined levels. Being so, the energy needed to excite an electron or to remove it is also in a well-defined frequency. I think that's why non-free electrons don't absorb all frequencies…
Did I answer your question??

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Angeliki, MEMBER 18, Greece 157 poäng (KOL)		June 23, 2010 14:30 Well, let's summarise at first what we know... As you said, the only difference between the two cases is that in the second one the electron is in orbit around the nucleus and it can only travel in special orbits: at certain "distances" from the nucleus with specific energies. So, the electron of an atom cannot absorb any photon because it MUST have specific energy. We now have to answer why. So, why is that so? It has been proved, right? On the other hand, a free electron does not have that kind of "restriction". So, an answer to your question could be that the nature of the electron is not the only thing that matters, its environment is also important, and in this case the different environment makes the electron behave differently, (This is just a thought, please tell me if I am wrong- maybe I've just said the obvious :P!)
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Well, let's summarise at first what we know... As you said, the only difference between the two cases is that in the second one the electron is in orbit around the nucleus and it can only travel in special orbits: at certain "distances" from the nucleus with specific energies. So, the electron of an atom cannot absorb any photon because it MUST have specific energy. We now have to answer why. So, why is that so? It has been proved, right?

On the other hand, a free electron does not have that kind of "restriction".

So, an answer to your question could be that the nature of the electron is not the only thing that matters, its environment is also important, and in this case the different environment makes the electron behave differently,
(This is just a thought, please tell me if I am wrong- maybe I've just said the obvious :P!)

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Natalia, FORUM MODERATOR 17, Greece 851 poäng (SILICON)		June 27, 2010 17:53 Sorry to interrupt, but I'd like to understand your thoughts better... If an electron travelling in an orbit gets an additional photon (meaning more energy), gaining more energy could detach it from its orbit, right? Is the question why this does NOT happen? I mean, do you ask why it would be a "problem" if the electrons escaped their orbit...? And a question: What do you mean by absorbing a "frequency" of a photon? Don't photons travel in a straight line? :-S
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Sorry to interrupt, but I'd like to understand your thoughts better... If an electron travelling in an orbit gets an additional photon (meaning more energy), gaining more energy could detach it from its orbit, right? Is the question why this does NOT happen? I mean, do you ask why it would be a "problem" if the electrons escaped their orbit...?
And a question: What do you mean by absorbing a "frequency" of a photon? Don't photons travel in a straight line? :-S

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Rocker_in_M, MEMBER 18, Cyprus 752 poäng (NITROGEN)		July 1, 2010 22:06 I have an idea . I know that molecules absorb certain frequencies of light due to resonance of those frequencies with the frequency of oscillation of the atoms that consists the molecules . Electron behave also like a particle ... so maybe when it is in a certain orbit it is forced to behave like a wave with a certain frequency ... and only electrons that cause resonance can excite it while free electrons don't have this restrictions . what do you think?
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I have an idea . I know that molecules absorb certain frequencies of light due to resonance of those frequencies with the frequency of oscillation of the atoms that consists the molecules . Electron behave also like a particle ... so maybe when it is in a certain orbit it is forced to behave like a wave with a certain frequency ... and only electrons that cause resonance can excite it while free electrons don't have this restrictions . what do you think?

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Argentum, MEMBER 19, United States 16 poäng (VäTE)		April 15, 2011 22:08 In theory an atom has multiple energy level’s that hold electrons. The amount of energy needed to go from one level to a higher level is called a quantum Level. Electrons around an atom will only absorber a photon, if the energy from the photon is exactly what it takes for it to jump to a higher quantum level. And it will only release energy to the exact amount that will return it to the next lowest quantum level. Every type of atom has quantum level’s at different distances from its nucleus so when it release the energy at each quantum level the photon (if in the small range we can see) is seen as a different color this is how we see all things. Neon is a good example of this, when energized the electrons let off a wavelength we see as an orange color. Most glass made these days is very nice as it absorbs harmful photons that may cause sunburns and cancer. This is also how phones, radio’s and many wireless devices work through walls and why you lose cell phone reception in tunnels, the further the signal (photon) has to travel the higher the odds that it will hit something that will absorb it. Recap: 1) A photon at a precise wavelength is absorbed by an Electron 2) This Electron jumps an exact number of quantum level’s 3) The Electron releases a photon at each quantum it drops returning to it’s original position around the atom. 4) When Neon’s electrons drop back down they release a photon at a wavelength we see as orange. 5) a free Electron dosnt have to worry about Quantum level's so it can take any kind of wavelength
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In theory an atom has multiple energy level’s that hold electrons.  The amount of energy needed to go from one level to a higher level is called a quantum Level.    Electrons around an atom will only absorber a photon, if the energy from the photon is exactly what it takes for it to jump to a higher quantum level.  And it will only release energy to the exact amount that will return it to the next lowest quantum level.  Every type of atom has quantum level’s at different distances from its nucleus so when it release the energy at each quantum level the photon (if in the small range we can see) is seen as a different color this is how we see all things. Neon is a good example of this, when energized the electrons let off a wavelength we see as an orange color.

    Most glass made these days is very nice as it absorbs harmful photons that may cause sunburns and cancer. This is also how phones, radio’s and many wireless devices work through walls and why you lose cell phone reception in tunnels, the further the signal (photon) has to travel the higher the odds that it will hit something that will absorb it.

    Recap:

1) A photon at a precise wavelength is absorbed by an Electron

2) This Electron jumps an exact number of quantum level’s

3) The Electron releases a photon at each quantum it drops returning to it’s original position around the atom.

4) When Neon’s electrons drop back down they release a photon at a wavelength we see as orange.

5) a free Electron dosnt have to worry about Quantum level's so it can take any kind of wavelength

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