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

In summary, the speed of electrons when they strike the screen in a typical color television tube can be calculated using the formula for kinetic energy, which includes the voltage, charge, and energy. This can be found in any physics book or by searching online.
  • #1
S1CkFiSh
22
0
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)
 
Physics news on Phys.org
  • #2
What is the energy to move a charge through a voltage?
Then if no energy is lost this becomes kinetic energy
 
  • #3
These are the possible answers.
a. 0.55c.
b. 0.09c.
c. 0.30c.
d. 0.90c.
 
  • #4
I know the answer - the point is for you to learn something
 
  • #5
I don't know what formula to use.
 
  • #6
You need an equation with voltage, charge and energy - have you come across electron-volt?

Do you know the equation for kinetic energy?
 
  • #7
No, I just need the exact formula then I will know what to do from there.
 
  • #8
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.
 

1. What is the speed of electrons when they strike the screen?

The speed of electrons when they strike the screen depends on a variety of factors, such as the type of screen, the voltage of the electron gun, and the distance between the electron gun and the screen. Generally, the speed of electrons can range from a few hundred meters per second to nearly the speed of light.

2. How does the speed of electrons affect the image produced on the screen?

The speed of electrons can affect the image produced on the screen in a few different ways. If the electrons are moving too slowly, the image may appear fuzzy or blurry. If the electrons are moving too quickly, the image may appear distorted or have too much brightness and contrast. It is important to carefully control the speed of electrons to produce a clear and accurate image on the screen.

3. Can the speed of electrons be adjusted?

Yes, the speed of electrons can be adjusted by changing the voltage of the electron gun or by altering the distance between the electron gun and the screen. This allows for precise control over the speed of electrons and ultimately, the quality of the image produced on the screen.

4. How does the speed of electrons compare to the speed of light?

The speed of electrons is significantly slower than the speed of light. While electrons can reach speeds close to the speed of light in some cases, they are generally much slower. This is due to the fact that electrons have mass, whereas light does not. Therefore, it takes much more energy to accelerate electrons to high speeds.

5. Why is the speed of electrons important in scientific research?

The speed of electrons is important in scientific research because it can impact the accuracy and quality of data collected. In experiments involving electron beams, researchers must carefully control the speed of electrons to ensure accurate measurements and observations. Additionally, understanding the speed of electrons can provide valuable insights into the behavior of particles and the properties of materials.

Similar threads

  • Introductory Physics Homework Help
Replies
3
Views
1K
  • Introductory Physics Homework Help
Replies
3
Views
1K
  • Introductory Physics Homework Help
Replies
3
Views
1K
  • Introductory Physics Homework Help
Replies
4
Views
981
  • Introductory Physics Homework Help
Replies
34
Views
2K
  • Introductory Physics Homework Help
Replies
4
Views
2K
  • Introductory Physics Homework Help
Replies
14
Views
2K
  • Introductory Physics Homework Help
Replies
7
Views
906
  • Introductory Physics Homework Help
Replies
1
Views
749
  • Introductory Physics Homework Help
Replies
4
Views
1K
Back
Top