Uncertainty principle and tv picture tube

  • Thread starter matpo39
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  • #1
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hey, Im really confused with this problem, i have tried to solve it for a while now but i cant seem to get it, i really dont even know where to start with it.

In a TV picture tube the accelerating voltage is V, and the electron beam passes through an aperture with a diameter of Delta_y and hits a screen which is a distance of x away.

What is the uncertainty in position of the point where the electrons strike the screen?
Use h for Planck's constant, m_e for the mass of an electron, and e for the magnitude of the charge on an electron.

any help would be great.
 

Answers and Replies

  • #2
Galileo
Science Advisor
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The idea is that the uncertainty in the position of the particle after it passes the aperture is [itex]\Delta y[/itex], which, if it is small enough, leads to an uncertainty in the momentum of the particle.

Use Heisenberg to find the order of this uncertainty in momentum.
 
  • #3
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when i find the uncertainty in the momentum that will be the x component of the momentum since it is a distance x away from the tv?
 

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