Why photon with no charge produces force on charges?

  • Thread starter wudingbin
  • Start date
24
0

Main Question or Discussion Point

why photon has no charge though it is produced by either proton and electron, which are both charged??
 

Answers and Replies

CompuChip
Science Advisor
Homework Helper
4,284
47
What is the charge of a proton?
What is the charge of an electron?
What is their total charge?

By the way, is this reaction ([itex]p^+ + e^- \to \cdots \gamma[/itex]) even allowed?
 
Last edited:
neu
220
1
Either .... and .... does not make sense.

Do you mean photon emission by the transition of an atomic electron?
 
Danger
Gold Member
9,564
244
As far as I understand particle physics, a photon is a bosun. As such, it transfers a charge from one place to another, but doesn't have one of its own.
 
neu
220
1
As far as I understand particle physics, a photon is a bosun. As such, it transfers a charge from one place to another, but doesn't have one of its own.
No, Bosons can have charge, e.g. W+/-.

Bosons are just integer spin particles, they can be massive, massless, charged neutral ...

The photon is a massless boson which couples to electric charge and as such mediates the electromagnetic force.

A photon can be produced by a charged particle if it is energetically favourable, that is if the particle has sufficient energy to emit a real photon, or if a photon can be emitted and absorbed within the time permitted by the uncertainty principle (a virtual photon).

So an electron can emit a photon, for example when traversing matter at high energy and being decelerated by the electric fields of the atoms of the medium, or when changing energy level in an atom, or in annihilation with it's antiparticle etc etc.

It doesn't loose its charge (except in annihilation where all charge is destroyed).
 
Last edited:
Danger
Gold Member
9,564
244
Okay, I knew that a photon can be emitted by an electron reverting to ground state, but I didn't realize that it could take the negative charge with it when it left.
 
neu
220
1
Okay, I knew that a photon can be emitted by an electron reverting to ground state, but I didn't realize that it could take the negative charge with it when it left.
No, I didn't say that, at least I didn't mean to. A photon is always neutral, it couples to electric charge i.e. it can only interact with charged particles but it itself is never charged. Never

The electron retains its charge throughout, the photon only gains energy
 
24
0
how to interact with charged particles, if photon contain no charge?
as we all know photon have electric and magnetic components.
so, where to the charge in the electric component go to???
 

Related Threads for: Why photon with no charge produces force on charges?

  • Last Post
Replies
16
Views
1K
  • Last Post
Replies
18
Views
2K
Replies
10
Views
3K
Replies
2
Views
671
Replies
6
Views
2K
Replies
29
Views
8K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
8
Views
5K
Top