Comparing kinetic energy of electron and alpha particle with same radius of curvature

[doggitz]

Homework Statement

Suppose that I want to compare the Kinetic Energy of an electron to the Kinetic Energy of an alpha particle if they both have the same radius of curvature in a magnetic field.

Homework Equations

qvB = mv^2/r
KE = 1/2 mv^2

The Attempt at a Solution

I am studying for my PE and I have run across this problem. I just want to know if the equations that I show are the correct ones for this problem. I am wondering if I have to set two (2) versions of these equations equal to each other (one for electron -- one for a-particle) ??

If anyone has a solution then please share it with me.

 

[diazona]

Have you tried working the problem all the way through? It shouldn't be hard...