|Jul21-06, 11:00 PM||#1|
I found an old post with an almost identical question: http://www.physicsforums.com/showthread.php?t=54092
However, I still don't see how to work the problem.
My question is phrased exactly the same, except B = 0.0170T and it's a 750eV electron.
I have absolutely no clue how I'm supposed to relate eV to velocity, but I'm pretty sure (at least I read it somewhere on the web) I should be able to set 1/2mv^2 = eV.
If I do this I end up with v = sqrt(2eV/m) = 4.06*10^16.
Plugging that into the equation E = vB = 6.90*10^14.
That's way off......... The answer should be kV/m, and from various friends that have gotten it right I hear it should be 3 digits (i.e. 100 <= answer <= 999).
Can somebody give me a hint, help me along here?
EDIT: I have another question in which I need to somehow related eV to velocity as well. This one is finding the radius of a cyclotron, given it's to accelerate to 32.0 MeV using magnetic filed 4.5T. I know r = mv / qB, so once again I'm missing v.
|Jul22-06, 03:28 AM||#2|
|Jul22-06, 08:13 AM||#3|
Ok..... So 1eV = 1.6*10^-19J
750eV*1.6*10^-19 = 1.2*10^-16 = j
v = sqrt(2j/m) = sqrt(2.4*10^-16 / 9.11*10^-31) = 1.623*10^7
still not right, is it?
|Jul23-06, 10:06 AM||#4|
never mind, I got it. thanks!
|Similar Threads for: Velocity Selector|
|Plate Capacitors (Velocity selector)||Introductory Physics Homework||1|
|Velocity Selector||Introductory Physics Homework||1|
|Electricity and Magnetism in a veloctiy selector||Introductory Physics Homework||1|
|velocity selector||Introductory Physics Homework||0|
|Type selector please help!||Computing & Technology||6|