Questions tagged [soft-question]

Questions that ask about some aspect of physics research or study which doesn't involve the actual physics. In general, soft questions can be answered without using physical reasoning.

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0answers
26 views

How do physicists navigate disagreements between communities in their field? [closed]

I came across the following post: https://www.quora.com/What-is-an-intuitive-explanation-of-Yang-Mills-theory The author of the first answer to the question seems to disagree a bit with the ...
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1answer
66 views

Which is the state of the art of relativistic many-body QFT?

We have a class of relativistic quantum field theories, typically used to calculate particle interactions (scattering) or to extend the Standard Model. Typically one start with a "free" theory, then ...
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1answer
49 views

What is gravitational constant in this context? [closed]

I've been reading an article and it gives me the following formula: $\vec{v}_B(t) = \vec{v}_0 - \mu_sgt \hat u_0$ It governs the velocity of a ball. In its explanation, it says: The ...
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0answers
61 views

What exactly is physics? [closed]

I have an assignment for school, and one of the questions was literally, "what is physics?" I gave an answer, but I still wondered. What exactly is physics? What is the meaning and the origin of the ...
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2answers
112 views

Why do scientists need to measure extremely small intervals of time?

Why do scientists need to measure extremely small intervals of time? Why is it necessary?
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1answer
58 views

Notation for vector time derivatives

So I am self-studying mechanics using Marion and, as many books, it uses the notation of the dot over the function to express a time derivative, as in $$x = x(t)$$ $$\dot{x}= \frac{dx}{dt}(t) $$ The ...
2
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1answer
23 views

When is a topic within the domain of Physics and when is it Applied Maths or Engineering? [closed]

I'm curious as to why some topics, e.g. fluid dynamics, are more often associated with particular university departments. For example, the study of water waves is usually something given by ...
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4answers
61 views

Do physicists distinguish things that can be explained through the movement of matter as opposed to some unseen or non-material forces?

Do physicists distinguish things that can be explained through the movement of matter as opposed to some unseen or non-material forces? For example, in quantum mechanics, the act of observing ...
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3answers
289 views

Why are blue light-emitting diodes important enough to warrant a Nobel prize? [closed]

I am using a miniature blue light as night bed room light since my childhood. For me blue light-emitting diodes almost look like miniature blue lights. I don't see any fundamental scientific ...
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0answers
10 views

Non-isotropic Universe and Fine structre constant [duplicate]

I have read an article on a popular science website about variation of fine structure constant, it suggest that the universe may be non-isotropic, if that is correct how would it affect relativity? ...
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0answers
19 views

Rpm vs Electrical Output | Relationship

Is there a mathematical law for when you spin an electric generator a certain amount of times faster you can figure out how many times more electricity is produced?
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2answers
55 views

momentum theorem more general than Newton's 2nd law [closed]

Now that momentum theorem is more general than Newton's 2nd law, as the former incorporates the variable mass scenario, while the latter doesn't, why is Newton's 2nd law put at a higher status? By ...
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16 views

Why does wave diffraction occur in vacuums?

EM waves don't encounter any obstacles/apertures in a vacuum, so why would diffraction occur in the first place in a vacuum? If diffraction does occur, then it would decrease an EM wave signal's ...
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2answers
63 views

Book recommendations on General Relativity [duplicate]

I am interesting in teaching myself General Relativity, since I only learned Special Relativity during my bachelor in Physics. Now, I have turned into math, but nevertheless I remember enjoying ...
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1answer
52 views

Why a symmetry, in Lagrangian field theory, should allow a boundary term?

Following the discussion in this paper (discussion around Eq. (3) in Page 4) and these lecture notes (discussion in Section 1.2.1 in page 10) given a field theory in some spacetime $(M,g)$ described ...
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2answers
140 views

What does meant AC corona? Any connection to coronavirus? [closed]

In the abstract of this paper Authors said in abstract of that paper entitled Simulation of the AC corona phenomenon with experimental validation : ".....,This phenomenon is also associated with ...
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0answers
48 views

Online courses on Analytical Mechanics [duplicate]

I'm having trouble understanding some concepts in Analytical Mechanics (particularly, the usage of lagrangean multipliers to get to the equations of motions and Noether's theorem) and I'm wondering if ...
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3answers
114 views

Is it necessary to memorise physics derivation? Or solving problem is important? [closed]

I am a undergraduate physics student of open university I am in fear that I may forget derivation and even I already forget some of derivation of oscillation and waves but while I was learning them I ...
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1answer
41 views

Mathematical convention when using spatial indices: numerical $(1,2,3)$ versus Cartesian $(x,y,z)$ [closed]

When writing a document I find that I am switching back and forth between indicial notation for spatial coordinates. I would like to get your thoughts on the following examples accompanied with ...
4
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1answer
111 views

Does Hawking Radiation lead to Black Hole Evaporation / Reduction of Black Hole Mass?

As I understand, Hawking radiation leads to black hole evaporation, resp. a black hole would lose mass due to that effect. Now Hawking radiation is very similar to Unruh radiation, i.e. some (...
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2answers
58 views

Using technology in Physics [closed]

Currently I find that technology is a wonderful tool in efficiently understanding physics. It helps in giving access to resources and providing a better understanding of topics but what I dislike is ...
2
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3answers
87 views

Can local experiments determine whether spacetime is static or not?

As far as I understand, there is no local experiment that can determine whether one has crossed the event horizon of a black hole or not. At the same time, spacetime in a black hole is non-static if ...
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0answers
53 views

What's the status of the axiomization of physical theories? [duplicate]

I'm interested in physical theories taking the form of precise, unambiguous mathematical statements. What significant work has been done to axiomize physical theories? What is left to be done? The ...
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0answers
47 views

Cooling down person to nK scale [closed]

If I were able to instantaneously cool my immediate surroundings to about 7nK, what would happen to me? How long would it take me to freeze?
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17answers
8k views

Can a mathematical proof replace experimentation?

I know that this is very similar to How important is mathematical proof in physics? as well as Is physics rigorous in the mathematical sense? and The Role of Rigor. However, none of the answers to ...
2
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0answers
41 views

Is it too late learn physics properly now that I am a 3rd year student? [closed]

This may seem a bit silly. I am 21 years old 3rd physics undergraduate. Even, after taking a three year undergrad physics course it feels like I haven't really understood what I learnt, didn't learn ...
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0answers
85 views

Uncertainty as a founding principle of QM? [closed]

Ideally, every new physical theory is derived from its fundamental principles. Hall & Reginatto derived the Schrödinger equation from an uncertainty principle and probabilistic classical mechanics,...
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0answers
64 views

Looking for a buddy for studying QFT [closed]

I'm in the middle of the 1st QFT course (following Peskin&Schroesder and some lecture notes). It's rather a hobby (have a full time job in a different area + family). It would be really nice to ...
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1answer
322 views

What was the shortest PhD thesis in physics? [closed]

When I took freshman physics in 1983, my professor made an off-handed comment that Louis de Broglie's PhD thesis on the matter wave was only 3 pages long, and that it was the shortest PhD thesis ever ...
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2answers
2k views

Is it possible to re-identify a particular electron? are there identity conditions for electrons?

I think that being able to formulate a clear identity criterion for the objects it deals with is important for any theory. For example, set theory starts by the extensionality axiom telling that <...
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1answer
79 views

How is the electric potential at infinity zero in the “Isolated sphere” case of a spherical capacitor?

The following statement is from the book Concepts of Physics by Dr. H.C.Verma, from the chapter on "Capacitors", under the topic "Spherical Capacitor - Isolated sphere": If we assume that the ...
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0answers
33 views

How to explore astrophysical fluid dynamics?

I'm a second year aerospace engineering undergrad student. I'm currently part of a project dealing with boundary layer flows on supersonic flights, and I find it to be really interesting. I wish to ...
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0answers
66 views

Understanding Quantum Mechanics in short term [duplicate]

I have been told by professors that in order to understand physical interpretation of Wave function and De Broglie Wave, one must understand the history of Quantum Mechanics that started with the '...
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1answer
58 views

What are the efficient ways of reading a physics research paper, understand and come up with new ideas? [closed]

I am planning to do research in theoretical particle physics and phenomenology. But as opposed to reading a textbook, I find that understanding journal papers to complete satisfaction could be quite ...
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0answers
35 views

What should be Lecture flow while studying electrostatics, capacitor and current electricity?

Sometimes while studying electric field and charges I get some new terms, and while studying electric potential I get confused how the potential works. And then while studying current electricity, I ...
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0answers
78 views

General relativity's prerequisites' prerequisites [closed]

I know there looks to be a duplicate: What are the prerequisites to studying general relativity? From what I read, the prerequisites are Calculus, linear algebra, differential and partial ...
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1answer
55 views

What happens when we change the order of colours in Newton disc?

In Newton Disc, different colours constituting the visible region of the electromagnetic spectrum are arranged in the same order as they appear in the spectrum (increasing/decreasing order of ...
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1answer
41 views

Where does the Boltzmann Constant first appear in physics?

I'm a high schooler and am introduced to the basics of thermodynamics where I find $k_{B}$ as the Boltzmann Constant. It can be seen in the Maxwell's Distribution and appears once again in the ideal ...
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0answers
108 views

Who introduced the idea of Hilbert Spaces in physics?

I'm looking for the foundational paper / book that connected Quantum Mechanics and Hilbert spaces. EDIT: I've just read the first chapter of Neumann's "Mathematical Foundations Of Quantum Mechanics"....
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0answers
59 views

Non-mathematical description of manifolds and bundles in gauge theory [closed]

I am teaching myself gauge theory at the moment and occasionally I need to ask what may appear to be a very random or completely bizarre question that is way off, just in order to check if I have ...
1
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1answer
58 views

What is the significance of slashed lines used to represent a surface in mechanics?

Almost in all diagrams in mechanics, I noticed that a surface is represented by a line with a lot of slashes ("/") on one side, like the one shown below: I've seen this in optics where such slashed ...
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1answer
104 views

Why rectangular windows are so common? [closed]

Most of the windows in our rooms are mostly rectangular.Why don't we chose any other shape like circle,triangle or a trapezium.Does it affects airflow through room? Is the reason is that they look ...
2
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3answers
57 views

The beginning of a movement and the continuity of time? ( How can movement begin without a first beginning instant ?) [closed]

The question I am asking is not original , it is a very old problem dating back from antiquity. I would like to know how modern science has solved it; or, maybe, in which fallacious reasoning the ...
4
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1answer
73 views

Why is the diamond norm called like that?

The diamond norm is a measure of the distance between two quantum channels. If $\mathcal{E}_1$ and $\mathcal{E}_2$ are two channels, then the diamond norm is defined as $$ \delta^{\diamond}(\mathcal{...
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1answer
48 views

What is the significance of the height of these verical lines in Thermal Conductivity graph?

The following image is from the Wikipedia Article on Thermal Conductivity: Please click here if you want a good image resolution, as I was unable to upload it here due to "Unsupported Image Format". ...
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1answer
107 views

Will the debate over smallest entity possible ever end? [closed]

I think that we can't find the smallest possible entity because more sub particles would be consequently discovered. Will the debate ever end?
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10answers
11k views

Is it really better for the environment if I take the stairs as opposed to a lift?

This question is inspired by a sign I saw at a lift, which said something like: Going up 1 floor or down 2 floors? Take the stairs, it's better for your health and for the environment. There's no ...
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0answers
31 views

Newton's explanation for interference [duplicate]

If Isaac Newton believed that light is a particle, then how did he explain the interference phenomena?
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1answer
93 views

Did R. Feynman know about the different notations for exact and inexact differentials? [closed]

I remember reading a long time ago, the story of a student taking R. Feynman for responsible of her (I think it was a woman, not sure though) fail at an exam of physics because what was written in her ...
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0answers
22 views

Quantum Non-Demolition of entangled superposition using an electron with infinite spin

Disclaimer: I have no idea what I am talking about, as I just started college and barely understand quantum physics. If an electron can have a linear velocity of the speed of light, theoretically ...

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