Flow of electrons (electricity/mechanics problem)

  • Thread starter benji
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  • #1
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So here's the problem:

In a television picture tube, elections are accelerated from rest through a potential difference of 12,000 volts and move toward the screen of the tube. When the electrons strike the screen, x-ray photons are emitted. Treat the elections nonrelativistically and determine:

a) the speed of an electron just before is strikes the screen

b) the number of electrons arriving at the screen per second if the flow of electrons in the tube is 0.01 coulomb per second
I've already figured part a by setting potential energy (equalling charge multiplied by potential difference) equal to kinetic energy. My answer is 6.49*10^7 m/s.

However, b is where I'm having trouble. I don't know how to go about it. Could someone please point me in the right direction?
 

Answers and Replies

  • #2
1,444
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Since each electron has a charge of its own, the total charge for n number of electrons is the n times the charge of the electron
that is [tex] Q = Ne [/tex]
 

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