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Physics : Recent Questions and Answers (Page 5)

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

Why is the field quantization applied to the free particle?

This post claims that there is no real photon (particle) with a plane wave solution well-defined momentum state). It makes sense somehow to me. I can think of several...

Asked on 12/29/2021

2 answer

Are there non-constant potentials that result in eigenstates of the Hamiltonian that are all plane waves?

It is commonly known that the eigenstates to the Hamiltonian of a constant potential are plane waves, aka $$V(r) = V_0 Rightarrow Hpsi = n text{ with }...

Asked on 12/29/2021

2 answer

Confusion regarding variable light speed theories

Einstein and others have thought about VSL theories. But I am unable to understand how VSL theories can be consistent, for the following reasons: Don't we need some mechanism (like...

Asked on 12/28/2021

0 answer

Distance from Instantaneous Centre of Rotation in Bicycle Kinematic Model

I'm not sure whether this is the correct community to post this, so pardon me. I was studying the Bicycle Kinematic Model and came across 3 possible reference points for...

Asked on 12/28/2021

2 answer

Common misunderstanding of Birkhoff Theorem

I just found a paper "On a common misunderstanding of the Birkhoff theorem". This means that inside a spherically symmetric thin shell there is no gravitational force,...

Asked on 12/28/2021

1 answer

Calculate the average number of oscillators of an Einstein solid, in the grand canonical ensemble, when $qgg N$

I am quoting from "Equilibrium and non-Equilibrium Statistical Thermodynamics", by M. Bellac.$$Q_{(alpha, beta)} = sum_{N=0}^{infty} e^{alpha N} Z_{N}(alpha, beta) hspace{1cm} (3.127)$$Where $Q$ is the grand partition...

Asked on 12/28/2021

0 answer

Why don't thermometers measure internal energy directly?

As far as I can tell temperature seems to be defined as something like average kinetic energy per molecule, but not quite. It looks like it measures something proportional to...

Asked on 12/28/2021

2 answer

Use of angular diameter to determine distance in special relativity

Summary: at relativistic speeds, if you compute a planet's relative distance using angular diameter (roughly proportional to 1/angular diameter), will that computed distance increase or decrease linearly, assuming you are...

Asked on 12/26/2021

2 answer

Does the existence of soft Goldstone mode makes a topological superfluid unstable?

When people talk about topological order and Majorana fermions in a BCS superfluid, do they admit the existence of a massless Goldstone mode? (As I've heard that soft Goldstone mode...

Asked on 12/26/2021

1 answer

Interpretation of Hilbert space in the Wightman Axioms for QFT

My confusion is about the different Hilbert spaces we meet in QFT. In a first introduction to QFT, the Hilbert space is often taken to consist of wavefunctionals on classical...

Asked on 12/26/2021

4 answer

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