What speed do the electrons have when they strike the screen?

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Homework Help Overview

The discussion revolves around determining the speed of electrons striking a screen in a color television tube, specifically after being accelerated through a potential difference of 25,000 Volts. The subject area includes concepts of electricity and kinetic energy.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants explore the relationship between voltage, charge, and kinetic energy, with some questioning the specific formulas needed to solve the problem. There is a mention of electron-volts and kinetic energy equations.

Discussion Status

The discussion is ongoing, with participants offering hints about relevant concepts and formulas without providing direct solutions. There is a mix of attempts to guide understanding and requests for specific formulas.

Contextual Notes

Some participants express a desire for direct answers, while others emphasize the importance of learning and understanding the underlying principles. There is a lack of consensus on the exact approach to take, with various interpretations of the problem being explored.

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In a typical color television tube, the electrons are accelerated through a potential difference of 25,000 Volts. What speed do the electrons have when they strike the screen? (qe = 1.6 x10-19 C, me = 9.1 x10-31 kg)
 
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What is the energy to move a charge through a voltage?
Then if no energy is lost this becomes kinetic energy
 
These are the possible answers.
a. 0.55c.
b. 0.09c.
c. 0.30c.
d. 0.90c.
 
I know the answer - the point is for you to learn something
 
I don't know what formula to use.
 
You need an equation with voltage, charge and energy - have you come across electron-volt?

Do you know the equation for kinetic energy?
 
No, I just need the exact formula then I will know what to do from there.
 
Dude, just open the nearest physics book available and go to the section on voltage differences between two points in space, you'll know which formula to use right away

You can even google it.
 

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