Find Speed of Electron Given Momentum - Equation Explained

  • Thread starter Thread starter thata6
  • Start date Start date
  • Tags Tags
    Electron Momentum
thata6
Messages
5
Reaction score
0
find the speed of an electron.
given that the momentum of the electron is 4.8 x 10-19kg.m/s

p=mv/ sqr root of 1-(v/c)2



use the above equation to find v.
The solution in the textbook re-writes the above equation as
p=(mc)(v/c)/sqr root 1-(v/c)2. How on Earth do they come to this, and how is this equation solved. been sitting with this for a long time and very confused.
 
Physics news on Phys.org

Thread 'Direction of the magnetic field of an oscillating charge'

Hello everyone, I’m considering a point charge q that oscillates harmonically about the origin along the z-axis, e.g. $$z_{q}(t)= A\sin(wt)$$ In a strongly simplified / quasi-instantaneous approximation I ignore retardation and take the electric field at the position ##r=(x,y,z)## simply to be the “Coulomb field at the charge’s instantaneous position”: $$E(r,t)=\frac{q}{4\pi\varepsilon_{0}}\frac{r-r_{q}(t)}{||r-r_{q}(t)||^{3}}$$ with $$r_{q}(t)=(0,0,z_{q}(t))$$ (I’m aware this isn’t...
View full post »

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Similar threads

Momentum transfer in electron-proton collision
Replies
10
Views
3K
Find Relativistic Momentum Equation for a Moving Reference Frame?
Replies
13
Views
2K
Invariance of Energy Momentum Relativistic
Replies
16
Views
3K
Use relativity and the Larmor formula to calculate Lienard's formula
Replies
2
Views
2K
Lagrangian Problem (Find Relation between Amplitude and Momentum)
Replies
6
Views
3K
Is My Solution for the Speed of a Decaying Particle Correct?
Replies
13
Views
2K
Speed of sound in a relativistic fluid
Replies
4
Views
2K
Big Bang Nucleosynthesis; electron-photon ratio
Replies
0
Views
1K
Relativistic Harmonic Oscillator Lagrangian and Four Force
Replies
1
Views
2K
Darwin term in a hydrogen atom - evaluating expectation values
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top