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Motion of a charged particle in a magnetic field.

I cannot figure out what equations to use or how to set up the following problem. It just seems like there is some data missing that i need. Any insight as to where to start would really help!

A radioactive source emits alpha-particles with kinetic energies of 4MeV. What must be the value of an applied magnetic field so that the radius of curvature of the orbit of the alpha-particle is 10cm? Does the answer depend on the kind of medium it is emitted into?

Solution Summary

An alpha particle is moving in a magnetic field and the radiua of curvature of the field is given. The strength of the magnetic field is calculated.