00:01
In this problem, we have to drop feynman diagram for the following.
00:09
Now, a feynman diagram is a two -dimensional representation in which one axis, usually the horizontal axis, is the space axis, while the vertical axis is the time axis.
00:23
The particles and the antiparticles of spin half are represented as a straight line, while the spin one particles are represented as wavy lines.
00:34
Now, in the repulsion of two electrons via a photon, we will see that an incoming electron will be drawn like this, while an outgoing electron will be like this.
00:49
Similarly, another electron incoming will be like this, while the idgoing will be in this direction.
01:00
When the two electrons are close to each other, a photon will be exchanged between them.
01:04
A photon is a spin -1 particle, hence it is represented by a wavy line.
01:10
Here, the vertical axis represents the space axis, while the horizontal axis represents the time axis.
01:24
Now we have to draw the feynman diagram of the attraction between an electron and opposetron via a photon.
01:34
So, for a particle, electron will be represented in this manner, while an opposite -tron will be in this manner.
01:49
An exchange of photon will take place between them.
01:54
So, this is the space axis, while this is the time axis.
02:01
Now, in the third part we have to draw a repulsion of two positrons via a photon.
02:10
This is a positron before, and this is a positron after...