# Particle detection

1. Mar 30, 2005

### rayveldkamp

Hi, does anyone know of something of length of order 10^-21 m? I need it for an assignment to describe the detection of something of that length

Regards
Ray Veldkamp

2. Mar 30, 2005

### humanino

Look : $$\hbar c$$ = 200 MeV fm

so, $$10^{-21}$$ m naturally correspond to energies of order 200 TeV !

Dude, that's a lot ! No current accelerator is able to reach this energy.

Are you certain of the value you are quoting here ?
Could it be the teacher is trying to trick you ?

3. Mar 30, 2005

### rayveldkamp

Yeh its definitely that small, its this stupid unit called methods of experimental physics, we all got assigned a power of 10 and told to describe the operation of a detector to measure a length of that magnitude...i fail to see any point in this but its gotta be done