Why do electrons emit photons when they lose energy?

[rickyyeungyeung]

we know that when a electron lost its energy , it will emit photon , but why electron have a photon inside ? does it already exit in a electron from the beginning or it comes from environment ? if comes from environment , where does photon come from?

 

[Drakkith]

No, photons are not inside of electrons. They are created by changes in the electromagnetic field, which in turn are generated by the acceleration of charged particles (like electrons and protons) along with changes in their states when bound together (as in atoms and molecules).

 

[rickyyeungyeung]

No, photons are not inside of electrons. They are created by changes in the electromagnetic field, which in turn are generated by the acceleration of charged particles (like electrons and protons) along with changes in their states when bound together (as in atoms and molecules).

so which kind of substance produce them?

 

[Nugatory]

so which kind of substance produce them?

Nothing creates them - in fact, for most realistic physical systems there's not even a meaningful notion of how many photons are present, so talking about creating and destroying them makes little sense.

When an electromagnetic field interacts with matter there's an exchange of energy and momentum between the two; it turns out that this exchange always transfers discrete amounts of energy and momentum at a single time and place. When this happens we say, depending on the direction of transfer, that "a photon was absorbed" or "a photon was emitted" at that time and place.

 

[rickyyeungyeung]

Nothing creates them - in fact, for most realistic physical systems there's not even a meaningful notion of how many photons are present, so talking about creating and destroying them makes little sense.

When an electromagnetic field interacts with matter there's an exchange of energy and momentum between the two; it turns out that this exchange always transfers discrete amounts of energy and momentum at a single time and place. When this happens we say, depending on the direction of transfer, that "a photon was absorbed" or "a photon was emitted" at that time and place.

thanks so much for the reply, so what you mean photon

Nothing creates them - in fact, for most realistic physical systems there's not even a meaningful notion of how many photons are present, so talking about creating and destroying them makes little sense.

When an electromagnetic field interacts with matter there's an exchange of energy and momentum between the two; it turns out that this exchange always transfers discrete amounts of energy and momentum at a single time and place. When this happens we say, depending on the direction of transfer, that "a photon was absorbed" or "a photon was emitted" at that time and place.

thx so much for the reply, what u mean photon is just a kind of energy exchanged within atoms and electricmagnetic field, so what i can day photons either located in electricmagnetic field or atoms ,is that correct?

 

[hmmm27]

No, but the photon is "made" from some of the electron's energy.