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

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SUMMARY

Electrons in a typical color television tube are accelerated through a potential difference of 25,000 Volts, resulting in significant kinetic energy upon striking the screen. The relevant equation to calculate the speed of the electrons involves the relationship between voltage, charge, and kinetic energy. The possible speeds of the electrons are given as options, with the correct calculation leading to a speed of approximately 0.55c. Understanding the concept of electron-volts and the kinetic energy formula is essential for solving this problem.

PREREQUISITES
  • Understanding of kinetic energy equations
  • Familiarity with electron-volts and their significance
  • Basic knowledge of voltage and potential difference
  • Concept of charge in physics (1.6 x 10-19 C)
NEXT STEPS
  • Study the kinetic energy formula: KE = 0.5 * m * v2
  • Learn about electron-volts and their application in physics
  • Research the effects of potential difference on electron acceleration
  • Explore the relationship between voltage, charge, and energy in electric fields
USEFUL FOR

Students and educators in physics, electrical engineers, and anyone interested in understanding electron dynamics in electric fields.

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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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