tough physics!!!! question!!!

Question

anonymous · Answer

attachment

anonymous · Answer

this is how I got B. and how i keep trying to get A. but it keeps coming out not correct? and without A i cant get C, or D.  Maybe i need to change my answers to seconds or something? not sure? I opened up my past tried answers so you could see. help!!!

anonymous · Answer

^ is an example of problem like mine

anonymous · Answer

@Mertsj

mertsj · Answer

Sorry.  I don't know physics.

anonymous · Answer

so, what value are you looking for here?

anonymous · Answer

the first one?
start from the definition of current = charge per unit time.
areal current density = number electrons / area of cross section
$$I={ne\over t}\implies n={It\over e}=\frac{(13)(1)}{1.6\times10^{-16}}=?
$$

anonymous · Answer

this gives you the number of electrons crossing the area of cross-section in one sec.

mertsj · Answer

What did you get for A?  I got 31.0633 amps/m^2

anonymous · Answer

doesn't it ask for the "number of electrons flowing"? not the current density..
anyways, when the asker is indifferent, why bother!!!

anonymous · Answer

these are simply the preliminaries for understanding electricity. no equations to remember, just the definitions or the meanings of the terms

mertsj · Answer

Yes it asks for electrons per square meter per second.