00:01
In this exercise, we have a proton that has an energy e that is equal to two times the rest energy of the proton.
00:12
And given this information, we want to find what is the momentum p of the proton.
00:18
So first, notice that i've written here two formulas.
00:22
One is the formula of the total energy of a particle, and according to spectral activity, and it's equal to the square root.
00:31
Of e0 squared, e0 is the rest energy plus p c squared, where p is the momentum of the proton.
00:43
And e0 is the rest energy of the proton, and it's equal to mc squared.
00:51
So let's impose that the energy is two times e zero.
00:55
So you have that two times zero.
00:56
That's the total energy, so it's equal to the square root of e0 squared plus p c squared.
01:06
So i'm going to square both sides...