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Physics : Recent Questions and Answers (Page 122)

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

Lagrangian of a free particle in Special Relativity and equivalence between mass and energy

I am a bit confused on the way Landau derives the Lagrangian of the free particle in SR (L. Landau, E. Lifshitz - The Classical Theory of Fields) and his...

Asked on 08/10/2021

3 answer

Are unstable particles created with an exact mass, or masses distributed in resonances?

I'm pretty comfortable with QFT, but this is a conceptual point I feel shaky on. For example, when creating $Z$ bosons in a process like $e^+ e^- rightarrow...

Asked on 08/10/2021 by benjj

2 answer

Moment of inertia of a ball filled with water

Let's say, I have a ball filled with water fixed to a massles rod undergoing oscillations I've been told that the moment of inertia can be taken as $m...

Asked on 08/10/2021

1 answer

How to interpret overlap in Hamiltonian if it is not a degeneracy?

In Fruchart et al.'s An Introduction to Topological Insulators, the Bloch Hamiltonian for a two-band insulator is given in the general form $ H(k)= $begin{bmatrix}...

Asked on 08/09/2021

0 answer

How do I determine an unknown element if I know the diffraction lines?

I'm not quite sure if I fully understand x-ray diffraction yet. In a standard XRD experiment, if I'm given the $theta$ values for the $K_{alpha}$ and $K_{beta}$ peaks, I can...

Asked on 08/09/2021 by whatwhatwhat

2 answer

Resource Recommendations: General relativity, local tetrads and particle physics

I'm still self-learning general relativity. I have been a huge fan of Andrew Hamilton's amazing lecture notes on GR, black holes and cosmology. He goes through GR...

Asked on 08/09/2021

4 answer

Laws of motion while climbing a rope

I'm a little confused with the application of laws of motion on a man climbing a rope. Suppose a man of mass Mg is climbing a rope with an acceleration...

Asked on 08/09/2021 by jatin

2 answer

Sphericty axis and thrust axis

I read a paper about the detection of the gluon at DESY in the 1979. There are described two methods of evaluating the results.I do understand that jets are...

Asked on 08/09/2021 by Lizzi

1 answer

Missing Resistance Component

Assume an object travelling in a horizontal plane with no friction and in a resistive medium. For resistive motion, I'm being taught that $ma = -R$, where $F=ma$...

Asked on 08/09/2021 by AlphaBio

1 answer

How wrong are the classical Maxwell's equations (as compared to QED)?

Now, I don't really mean to say that Maxwell's equations are wrong. I know Maxwell's equations are very accurate when it comes to predicting physical phenomena, but going through high...

Asked on 08/09/2021 by user28375028

5 answer

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