Physics Questions, Problems & Solutions : TransWikia.com ~ Page 741

Which pole will electrons flow towards in a changing magnetic field (generator)

In a generator a magnet spins in the middle of a coil of wire and the changing magnetic field causes current to flow, but the current changes direction whenever fields...

Asked on 12/13/2020

1 answer

Does the accelerated mirror violate the energy conservation principle within the framework of special relativity?

I have designed a thought experiment for which I could not find a convincing resolution as of yet. Assume that a plane mirror is uniformly accelerated (Born rigid acceleration) along...

Asked on 12/13/2020

3 answer

In a photovoltaic effect, when the electron absorbes the photon, is the electron's energy displaced?

I'm a super amateur wannabe physicist, and I'm trying to learn the fundamental workings of the photovoltaic effect. I haven't been able to understand "how" or "what" is displaced/transmitted in...

Asked on 12/13/2020 by guiie

3 answer

Amount and percentage of water in air

I was wondering about the relationship between the amount of water in the air, and the percentage. Is the following correct? Let's take an example of 20⁰C. According to ...

Asked on 12/13/2020

0 answer

$Fleft(mathbf r, frac{1}{i}nablaright)psi$ and $F(inabla, mathbf k)phi$ are FT's of each other if $psi$ and $phi$ are FT's of each other?

I'm reading Merzbacher's Quantum Mechanics and he states the above (for analytic $F$).To prove this, I could come up with the following, but am not sure if the...

Asked on 12/13/2020

0 answer

Why does combining background independence and diffeomorphism invariance force you to conclude that spacetime must be quantized?

I was recently watching a fermilab video on loop quantum gravity and at about 4:20 it is stated that, when combined, background independence and diffeomorphism invariance force you to conclude...

Asked on 12/13/2020 by oli bouchard

0 answer

Why Can't Energy Be Created Or Destroyed (Ik this has been asked numerous times by mine is slightly different)

I've heard a lot of times that energy cannot be created or destroyed. I get this in a nonfundamental way, a car's energy is the form of gas is transferred...

Asked on 12/13/2020

2 answer

Information loss of particles over time

Due to the nature of the Heisenberg uncertainty principle along with the Schrodinger equation, the position of a particle gains uncertainty / loses certainty over time, because its momentum is...

Asked on 12/13/2020 by Charles Averill

1 answer

Spin precession for Rabi oscillations : interpretation with magnetic field in rotating frame

The model considered Consider an atom modeled by a two level system of energy $hbar omega$. We assume this atom is interacting with an electric field through electric-dipole interaction....

Asked on 12/13/2020

1 answer

Why is momentum expectation zero for gaussian wavepacket by Ehrenfest theorem?

If $$psi(x)=Aexp(-x^2/a^2)exp(ikx)$$$langle{p}rangle=0$ since$langle{x}rangle=0$, since the integrand is an odd function and Ehrenfest theorem states $frac{dlangle{x}rangle}{dt}=frac{langle{p}rangle}{m}$. But explicit calculation of $langle{p}rangle= int^{infty}_{-infty}psi^*(x) hat{p} psi(x)dx$...

Asked on 12/13/2020

1 answer

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