Deriving and Verifying the Relativity Formula for Electron Speed

Click For Summary
The discussion focuses on deriving and verifying the relativistic speed formula for an electron influenced by an electric field. The proposed speed function is v(t) = At/√(1 + (At/c)²), where A is defined as qE/m. Participants are tasked with confirming that this function satisfies the differential equation dv/dt = (qE/m)(1 - v²/c²)^{-3/2}. The relationship between force and velocity is emphasized, noting their parallel alignment. The conversation aims to deepen understanding of relativistic effects on electron motion under electric fields.
Samkiwi
Messages
16
Reaction score
1
Homework Statement
I'm having trouble finding the proof of the relativistic acceleration formula starting from the velocity formula, I've been working on it for a long time but I can't solve this question. :)
Relevant Equations
electromagnetism and relativity
It is an electron initially pushed by the action of the electric field. The vectors of force and velocity are parallel to each other.

Here's the questionA possible expression of speed as a function of time is the following:

$$v(t) = \frac{At}{\sqrt{1 + (\frac{At}{c})^2}}$$where is it $$A =\frac{qE}{m}$$
Taking into account that [2] can be written in the equivalent form.
$$\frac{dv}{dt}=\frac{qE}{m}(1-\frac{v^{2}}{c^{2}})^{-\frac{3}{2}}[3]$$
verify by deriving and substituting that the function v (t) defined by [2] satisfies [3]
 
Last edited:
Physics news on Phys.org
Try this: $$v(t) = \frac{At}{\sqrt{1 + (\frac{At}{c})^2}}$$
 
thanks:bow:
 
If have close pipe system with water inside pressurized at P1= 200 000Pa absolute, density 1000kg/m3, wider pipe diameter=2cm, contraction pipe diameter=1.49cm, that is contraction area ratio A1/A2=1.8 a) If water is stationary(pump OFF) and if I drill a hole anywhere at pipe, water will leak out, because pressure(200kPa) inside is higher than atmospheric pressure (101 325Pa). b)If I turn on pump and water start flowing with with v1=10m/s in A1 wider section, from Bernoulli equation I...

Similar threads

Replies
25
Views
2K
  • · Replies 27 ·
Replies
27
Views
747
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 5 ·
Replies
5
Views
477
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 7 ·
Replies
7
Views
2K
Replies
10
Views
1K
  • · Replies 8 ·
Replies
8
Views
583
  • · Replies 8 ·
Replies
8
Views
1K