[topcasinobonua]

So let us ask whether there are people who want to see, observe and study even smaller things than the atomic nucleus.
Answer is of course yes and these people are called particle physicists.

But we forgot to tell you one thing. We were trying to look at smaller and smaller things.
This requires higher and higher energies. We can make it more precise but that will be a technicality.
For the time being just think that electrical appliances are cheaper than electronic appliances (just compare the price per gram).

So out of all branches of physics that we have covered so far which one will require highest energy?
Particle physics of course. Hence this branch of physics is also called high energy physics. Bingo! You know a technical term.