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OmegaFury

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## Homework Statement

In a certain particle accelerator, a current of 300μA is carried by a 4.00-MeV proton beam that has a radius of 1.30 mm. The mass of a proton is 1.67 x 10

^{-27}kg. If the beam hits a target, how many protons hit the target in 3s?

## Homework Equations

The only equation that even remotely comes to mind regarding this problem is I=e

^{2}n(tau)AE/m

_{e}

I do not know which variable has the electron volt unit, or an equation involving current and time.

## The Attempt at a Solution

I don't even know where to begin as I don't know a suitable formula to solve the problem. Perhaps if I knew that, I could get somewhere.

--Also, for personal curiosity-- In the formula for current that I listed, what exactly is tau?

Also, is n the number of particles, or the number density? And is E the electric field? My book didn't exactly break the formula down as well as I'd like.

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