Deflection of electron

In summary: Your calculations seem to be correct and according to these calculations, the vertical deflection of the electron after travelling 2.0 cm horizontally is 0.00226 meters.
  • #1
eltel2910
9
0
An electron with a kinetic energy 5000.0 eV (1 eV = 1.602×10-19 J) is fired horizontally over a charged plate with surface charge density +2.0 μC m-2. Taking the positive direction to be upwards (away from plate), what is the vertical deflection of the electron after it has traveled a horizontal distance 2.0 cm?

Here is my work:

Find V of electron - KE = .5mV ---> 41934557 = Velocity

time = s/V ----> .02m/41934557 --------> 4.769e^-10 = time

electric field E = sigma/2*Eo -----> 2.0e^-6/(2*(8.85*10^-12) ---->112994 = E

Force = q*E ------>(1.602*10^-19)(112994) ------->1.810e^-14 = F

acceleration = F/m -------> 1.810e^-14/(9.11*10^-31) = 1.98e^16. 9.11*10^-31=mass of one proton.

vertical deflection = d=.5at^2 --------> .00226=.5(1.98e^16)(4.769e^-10)^2

I come up with .00226 meters, but "the man" still says I'm wrong

Can you see anything wrong with my set up??
 
Physics news on Phys.org
  • #2
eltel2910 said:
Find V of electron - KE = .5mV ---> 41934557 = Velocity

time = s/V ----> .02m/41934557 --------> 4.769e^-10 = time

electric field E = sigma/2*Eo -----> 2.0e^-6/(2*(8.85*10^-12) ---->112994 = E

Force = q*E ------>(1.602*10^-19)(112994) ------->1.810e^-14 = F

acceleration = F/m -------> 1.810e^-14/(9.11*10^-31) = 1.98e^16. 9.11*10^-31=mass of one proton.

vertical deflection = d=.5at^2 --------> .00226=.5(1.98e^16)(4.769e^-10)^2

Can't see anything wrong except the one that has been highlighted.
 
  • #3


Based on your calculations, it appears that your method and equations are correct. However, there may be a small error in one of your calculations or in the conversion of units. I suggest double checking all of your calculations and units to make sure they are correct. Additionally, it may be helpful to provide more information about the specific error message you are receiving and the expected answer. This will allow for a more accurate assessment of the issue.
 

1. What is the deflection of electron?

The deflection of electron refers to the change in direction of an electron's path due to the influence of an external force, such as an electric or magnetic field.

2. How is the deflection of electron measured?

The deflection of electron can be measured using a cathode ray tube or an electron beam deflection tube. These devices use electric fields to deflect the electron beam, and the amount of deflection can be measured using a calibrated scale.

3. What factors affect the deflection of electron?

The deflection of electron is mainly affected by the strength of the external electric or magnetic field, the velocity of the electron, and the mass of the electron. Other factors such as the shape and size of the deflecting plates or coils can also influence the deflection.

4. How does the deflection of electron relate to the charge of the electron?

The deflection of electron is directly related to the charge of the electron. The greater the charge of the electron, the stronger the deflection will be when exposed to an external electric or magnetic field.

5. What are some practical applications of the deflection of electron?

The deflection of electron has many practical applications, such as in cathode ray tube televisions, oscilloscopes, and electron microscopes. It is also used in particle accelerators and mass spectrometers to manipulate and analyze charged particles.

Similar threads

  • Introductory Physics Homework Help
Replies
6
Views
1K
  • Introductory Physics Homework Help
Replies
4
Views
2K
  • Introductory Physics Homework Help
Replies
3
Views
1K
  • Introductory Physics Homework Help
Replies
11
Views
1K
  • Introductory Physics Homework Help
Replies
2
Views
1K
  • Introductory Physics Homework Help
Replies
1
Views
2K
  • Introductory Physics Homework Help
Replies
25
Views
2K
  • Introductory Physics Homework Help
Replies
1
Views
2K
  • Introductory Physics Homework Help
3
Replies
78
Views
4K
  • Introductory Physics Homework Help
Replies
34
Views
2K
Back
Top