Electrons: Position, Exit Angle, 2 cm Length Plates

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Homework Help Overview

The problem involves electrons moving horizontally at a specified speed as they enter a region between two plates, where they experience a significant vertical acceleration. Participants are tasked with determining the vertical position and exit angle of the electrons after passing through the plates, which are 2 cm in length.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Some participants identify the problem as related to projectile motion, noting the unusual acceleration compared to standard gravitational acceleration. Others express confusion about the setup, particularly regarding the length of the plates and how it affects the motion of the electrons.

Discussion Status

Participants are actively engaging with the problem, with some offering clarifications about the nature of the acceleration and its implications. There is a mix of understanding and uncertainty, particularly about visualizing the scenario and the role of the plates.

Contextual Notes

One participant mentions that the acceleration experienced by the electrons while between the plates is significantly greater than standard gravitational acceleration, which may influence their motion. There is also a visual aid provided to help conceptualize the setup, though some participants still seek clarification on the implications of the 2 cm length of the plates.

MissJewels
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Homework Statement


Electrons moving initially at 2.4 X 106 m / s in a horizontal direction. They enter a region between two plates of 2 cm in length and are subjected to an acceleration of 4x 1014 m/s2, vertical and pointing upwards. Determine:
a) the vertical position of the electrons as they exit the region between the plates
b) the exit angle


Homework Equations


Honestly, I don't even know where to start with this, I have no idea what it looks like! Can someone explain it to me, at least, what Its asking, in english?


The Attempt at a Solution


Can't even try, i don't get it.
 
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MissJewels said:

Homework Statement


Electrons moving initially at 2.4 X 106 m / s in a horizontal direction. They enter a region between two plates of 2 cm in length and are subjected to an acceleration of 4x 1014 m/s2, vertical and pointing upwards. Determine:
a) the vertical position of the electrons as they exit the region between the plates
b) the exit angle
This is a projectile motion problem. But, instead of the acceleration being g=9.8 m/s2, it is 4x1014 m/s2, downward.
Also, each electron travels 2 cm for the horizontal displacement, and we are given the initial velocity.

Hope that helps.
 


Redbelly98 said:
This is a projectile motion problem. But, instead of the acceleration being g=9.8 m/s2, it is 4x1014 m/s2, downward.
Also, each electron travels 2 cm for the horizontal displacement, and we are given the initial velocity.

Hope that helps.

Yes it does help, very much so! Thank you! I'll try that :)
 


Redbelly98 said:
This is a projectile motion problem. But, instead of the acceleration being g=9.8 m/s2, it is 4x1014 m/s2, downward.
Also, each electron travels 2 cm for the horizontal displacement, and we are given the initial velocity.

Hope that helps.

I still don't understand the 2 cm long plates buisiness though... can't seenm to picture what it looks like?
 


It would look something like this:
[PLAIN]http://teachers.sduhsd.k12.ca.us/gstimson/charonplatesPphys5.gif[/INDENT][/INDENT]
Each electron is starts out moving horizontally and passes in between the two square plates, say moving from left to right. When an electron is in between the two plates, it has an acceleration 4x1014 m/s2 downward. When it is outside of the plate area it has an acceleration of g = 9.8 m/s2, which can be ignored in comparison to the 4x1014 m/s2 acceleration.

In this problem, the square plates have a side length of 2 cm. Therefore the electron only experiences the 4x1014 m/s2 acceleration over a horizontal distance of 2 cm, i.e. while it is in the area between the two plates.​
 
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