Physics Questions, Problems & Solutions : TransWikia.com ~ Page 89

Why is there a factor of $hbar$ in the physicists' $mathfrak{su}(2)$ Lie algebra?

The standard (mathematicians') basis for the $mathfrak{su}(2)$ Lie algebra is:$$X_j = -ifrac{sigma_j}2$$ where $sigma_j$ are the Pauli matrices. In physics, observables correspond to real numbers, so...

Asked on 08/27/2021 by Nihar Karve

3 answer

Confusion with redshift

I got confused while reading about the cosmological redshift. Take an expanding Universe. If you look a galaxy moving with the Hubble flow, you will see the light...

Asked on 08/27/2021

2 answer

Where are the electrons of a cathode ray tube coming from when using AC?

I see in this picture a beam of electrons leaving the cathode. But I read before, that the electrons can flow out of a copper wire only, if they are...

Asked on 08/27/2021 by A.trudeau

3 answer

What is the connection between the Poynting vector (EM transverse wave) and the description of photons with $E=hf$ and $c=flambda$?

I think for radio antenna transmitters, if the AC current's frequency is at the frequency of radiowaves, EM waves in the radio frequency will be emitted? Then the frequency has...

Asked on 08/27/2021 by Austin Nguyen

1 answer

Gradient of function in terms of retarded time produces time derivative

In Griffith's introduction to electromagnetism on page 479, there is this following equation: begin{align*}nabla V &cong nabla left[frac{1}{4pi epsilon_0} frac{boldsymbol{hat r} cdot dot{mathbf{p}}(t_0)}{rc} right]&cong left[frac{1}{4pi epsilon_0}...

Asked on 08/27/2021 by Evan Dodson

1 answer

Is conservation of charge valid in QM?

In electromagnetism, we have the continuity equation $$frac{partial}{partial t} rho(vec{r},t) = - vec{nabla} cdot vec{j}$$ which, upon integration over a finite volume $V$ bound by surface $S$...

Asked on 08/27/2021

3 answer

Degeneracy in a Double Well Potential

Even though double well is a $mathrm{1D}$ potential and it must not have degenerate spectrum, then why does double well have degenerate energy eigenvalue?...

Asked on 08/27/2021

1 answer

Is the direction of a laser flash affected by the source's movement direction?

Supposing a spaceship is moving in space in a straight line at very high speed, with a laser source on top of it flashing straight up (i.e. orthogonal to the...

Asked on 08/27/2021 by ppam

1 answer

Is angular momentum conserved in case of a vehicle turning?

When a vehicle takes a turn is the sharpness viz radius of turn related to the velocity by conservation of angular momentum? If it is so then while going on...

Asked on 08/26/2021 by C Ray

4 answer

Proving that the angular velocity vector is equal to a limit involving the rotation vector

The angular velocity vector of a rigid body is defined as $vec{omega}=frac{vec{r}timesvec{v}}{|vec{r}|^2}$. But I'd like to show that that's equivalent to how most people intuitively think...

Asked on 08/26/2021

8 answer

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