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Physics : Recent Questions and Answers (Page 597)

Find answers to your questions about Physics or help others by answering their Physics questions.

Normalization Constant in Time Evolution of Density Matrix

Given the Hamiltonian:$$%H = omega left(|0rangle langle1| + |1rangle langle0| right) = begin{bmatrix}0 & omega omega & 0end{bmatrix}$$, I want to find the...

Asked on 02/03/2021 by Oti Dioti

2 answer

A Hollow Black Hole

I was just reading a question about the gravity inside a hollow neutron star. It was a trivial question, obviously there is no force felt. But then it got...

Asked on 02/03/2021

2 answer

Damped Oscillation and Period

In my school experiment, I wanted to measure the gravitational constant ($9.81 m/s^2$) by using a pendulum. If we take into account the damped oscillation (i.e. friction forces),...

Asked on 02/03/2021 by curious

2 answer

IR Wilson-Fisher fixed point

I was wondering how we define IR-fixed point, when we have more then one coupling. When the coupling is unique, it is simple, because we can look at the beta...

Asked on 02/03/2021

2 answer

Solids with very large specific heats

I've noticed that for many solids, specific heat is around 1 Kj/Kg*K is there a theoretical explanation for this? What common solids have the highest heat capacity per mass...

Asked on 02/03/2021

4 answer

In cavity quantum electrodynamics why is $langle hat{a} rangle$ called the cavity amplitude?

What is the physical meaning behind $langle hat{a} rangle$ (where $hat{a}$ is the annhilation operator)? I was thinking that it represents $sqrt{n}$ (where $n$ is the...

Asked on 02/03/2021 by Nice1m80

2 answer

How is most of the forces occurring around us related to electromagnetism?

Here is an extract from my textbook-Most of the phenomena occurring around us can be described under electromagnetism. Virtually every force that we can think of like friction, chemical force...

Asked on 02/03/2021 by Manan Arora

1 answer

Could spacetimes have singular manifolds?

Let's take a spacetime as a pair $(M,g)$ where $M$ is the manifold and $g$ the metric.I've seen that there exist a generalization of manifolds. This...

Asked on 02/03/2021 by miguelification

1 answer

Polarization by reflection - Brewster's angle

When incident light hits an interface of a dielectric surface at the Brewster angle, I understand that it will result in the generation of a perfectly polarized(horizontally) reflective ray and...

Asked on 02/03/2021

1 answer

Dimensions of momentum?

I am learning realitivity in college and in our class our lecturer explained four-momentum. When I was reading a book in QFT.it writes the momentum as $p^{mu} =...

Asked on 02/03/2021 by max_fisics

2 answer

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