00:01
All right, so we're looking at a particle composed of two upcorks and one downcork, like a proton, for instance.
00:09
And we're assuming they're all the same distance away from each other, and this distance we're told to assume is like 1 .36 times 10 to the negative 15 meters.
00:20
And the charge on an upcork will put like qu, this is equal to plus two thirds times the electron charge, and the charge of a down quark is negative one -third times the electron charge.
00:34
And we want to compute the potential energy of the two upcorks, and then the total potential energy of the entire system.
00:41
So the potential energy of the two upcorks is going to be like negative k, you know, qu squared over r.
00:50
The negative sign, because the potential energy for light charges is going to be negative.
00:58
The electric field between them would be positive, and when we take the potential energy is like the negative line integral of that, so we'll get a negative sign.
01:07
So if we plug in our numbers, what we're going to get is like negative four -thirds, or sorry, four -ninths, times k times e -squared over r.
01:19
And so one thing, to convert from joules to electron volts or mega -electron volts, you can actually just basically divide out one electron charge and that will give you your answer in joules.
01:31
So just make a note of that...