Homework Help: Alpha Particle speed problem

1. Jul 14, 2010

Kommandant

1. The problem statement, all variables and given/known data

An Alpha Particle is emitted with a kinetic energy of 2.34 MeV during a radioactive decay process. The maximum speed of the alpha particle is?

2. Relevant equations

KE=mv2
1 ev = 1.6x10-19j

3. The attempt at a solution
$$\sqrt{(2.34x10^6)(1.6x10^-19)/4(1.6x10^-27)}$$

Unfortunately the manual uses this solution for the problem:

$$\sqrt{2(2.34x10^6)(1.6x10^-19)/4(1.6x10^-27)}$$

Could anyone explain to me where the 2 comes from?

2. Jul 14, 2010

Kommandant

Nevermind... I see what I did wrong..

KE= 1/2 mv^2 DUHHHH