## alpha particles

An alpha particle (the nucleus of a helium atom) consists of two protons and two neutrons. A horizontal beam of alpha particles is injected with a speed of 2.0 105 m/s into a region with a vertical magnetic field of magnitude 0.113 T.

(a) How long does it take for an alpha particle to move halfway through a complete circle?

I am trying to apply this equation:

T = 2pieM/qB

and I thought about it, do I use the speed as my q and for m, find the mass of (two protons and two neutrons) for my m?
 PhysOrg.com science news on PhysOrg.com >> Galaxies fed by funnels of fuel>> The better to see you with: Scientists build record-setting metamaterial flat lens>> Google eyes emerging markets networks

Recognitions:
Homework Help
 Quote by whoknows12345 An alpha particle (the nucleus of a helium atom) consists of two protons and two neutrons. A horizontal beam of alpha particles is injected with a speed of 2.0 105 m/s into a region with a vertical magnetic field of magnitude 0.113 T. (a) How long does it take for an alpha particle to move halfway through a complete circle? I am trying to apply this equation: T = 2pieM/qB and I thought about it, do I use the speed as my q and for m, find the mass of (two protons and two neutrons) for my m?
Rather than trying to apply an equation why not start by telling us what physics law applies here.

The T is the period of the circular motion, m is the mass, q is the charge, and B is the magnetic field. Look up the mass of a helium atom and use that (the electrons do not add much mass). What is the charge of a helium nucleus?

AM
 i understand that, but when do I actually use my speed given to find the answer?

Recognitions:
Homework Help