Homework Help: Finding current

1. Apr 2, 2013

Jabababa

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

If a beam of 9.39 x10^20 alpha particles passes a given point in 1.50s, what is the current?

2. Relevant equations

I=q/t

3. The attempt at a solution

umm the answer is 2.00 x 10^2 A, not sure where to begin. Would be a great help if someone can point me to the right direction.

2. Apr 2, 2013

ap123

Just apply the equation you wrote in section 2.

3. Apr 2, 2013

Jabababa

umm can you show me? I dont see how that can come out to be 2.00 x 10^2 A.

4. Apr 2, 2013

ap123

What's the charge on an alpha particle?
Then you can work out the total charge passing the point in the 1.50s interval.
Then just apply the equation.

5. Apr 2, 2013

Jabababa

The charge of an alpha particle is +2.
How do i find the total charge? Because i dont know how to incorporate the 9.39 x10^20 part of the question into the equation.

6. Apr 2, 2013

PeterO

Charge is measured in Coulombs when using the standard equations !!!

7. Apr 2, 2013

ap123

The charge on one alpha particle is 2e
What's the charge on x alpha particles?

8. Apr 2, 2013

Jabababa

woot, thank you!! I got it.