Tagged Questions

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
4 views

Does Bell's inequalities also rule out non-computable local hidden variable theories?

I haven reading different articles on Bell's assumptions and interpretations, including susperdeterminsm. I always end up dizzy when I try tho think about this specific question, so any hints would be ...
1
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2answers
62 views

Differences between astronomy, astrophysics and cosmology? [on hold]

What is the main difference between Astronomy, Astrophysics, and Cosmology? I have the impression that astronomy is a subject that runs parallel to physics but it is outside the physics field. This ...
0
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1answer
23 views

Ideas for physics-related simulations to code up as weekend (or monthly) projects [on hold]

What are some good ideas for simulations that I could try to implement/code in my spare time just for educational purposes? I'm thinking that it would be a good way for me to delve into the underlying ...
3
votes
1answer
49 views

Is there a scientific term for star formation?

It might be my stupidity to think that many laymen terms that most people use to describe some physics phenomena usually have a scientifically accepted term or name? The process of star formation, ...
2
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2answers
68 views

Is a quark bomb possible?

I am wondering about the possibility of making a bomb out of the binding energy of quarks inside hadrons. I know that about confinement and all that, but I wonder if there is a way to harness this ...
0
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0answers
31 views

Why the viscosity $\mu$ is called “dynamic” viscosity? [on hold]

In fluid mechanics we have the co-efficient of viscosity $\mu$. Why is the adjective "dynamic" added to it?
1
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1answer
106 views

What kind of math is used in QFT? [duplicate]

What branch(es) of math are used in Quantum Field Theory? Or the question, by way of analogy: Tensor Calculus is to General Relativity as What is to Quantum Field Theory?
-3
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0answers
58 views

How can Einstein explain particles of light without particles?

how can Einstein explain particles of light without particles? For his Nobel prize he used Newtons explanation except both he and Newton agreed that aether solved the problem of going through holes. ...
1
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0answers
33 views

How big does a natural gas compressor station have to be, so as its possible explosion to produce power equal to that of a nuclear bomb [closed]

I live in Greece and a natural gas compressor station is going to be constructed within a radius of 3km. That got me wondered. Can a possible explosion produce equal power with the little boy, the ...
1
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2answers
32 views

Non-random observations (regarding physical quantity)?

Are there completely deterministic observations? More detailed: Talking about an observations process for which of the following sentences would you vote: Version 1 (always random): "These ...
0
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1answer
27 views

What's the relationship between input power and intensity / frequency of radiated EM waves?

I've seen an example of an electric dipole that radiates power proportional to $\ \omega^{4} $. My question is: given a fixed amount of input power to drive the dipole, while varying the driving ...
-3
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1answer
64 views

Effects of travel greater than speed of light [closed]

What will happen if a person with say weight of 100 kilograms, starts to travel with, a) equal to speed of light? b) greater than speed of light?
10
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4answers
482 views

What is an interpretation of quantum mechanics?

In the sense of "Copenhagen Interpretation", what exactly is an interpretation? What purpose does an interpretation serve? Can an interpretation be tested or even be correct or incorrect independent ...
0
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2answers
155 views

A universe of a finite but increasing number of states of motion?

A limitation of the geometric models of universe is that space locally is considered as a volume, whilst volume is a part of a selected system of inertia. Wouldn't it be more adequate to consider (the ...
2
votes
1answer
39 views

Prerequisites for Ptolemy's Almagest

I hope this is a valid question to ask on this website (since it's astronomy and not e.g. mechanics, I wasn't so sure). What prerequisites are needed for fully understanding Ptolemy's Almagest. Fully ...
1
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0answers
29 views

A-level electromagnetism experiments? [closed]

Does anybody know any A-level experiments investigating electromagnetism that can produce good data relatively simply?
-1
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0answers
30 views

Need video tutorials on undergraduate physics reference and course books

Hi I am looking for video tutorials/lectures of those using these two books (link below) as a reference or text book for the lectures. Fundamentals-Physics-Extended-David-Halliday ...
27
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2answers
2k views

What are Stephen Hawking's main contributions to research-level physics?

Without a doubt, Stephen Hawking is the most famous living scientist; indeed, his public visibility in all of history seems to be rivaled only by Einstein and easily eclipses giants of physics such as ...
4
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0answers
55 views

'Topological' Notions in Physics

So I've been trying to make sense recently of the usage of 'topological' in various fields of physics, and get sort of an intuition for what this means in context. This all boils down to my main ...
2
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2answers
95 views

How do you pronounce $\vec{A} \cdot \vec{B}$ and $\vec{A} \times \vec{B}$? [closed]

I'm French. I would like to know: How do you pronounce $\vec{A} \cdot \vec{B}$ : "A scalar B" or "A dot B" ? How do you pronounce $\vec{A} \times \vec{B}$ : "A vectorial B", "A vector B", "A cross ...
1
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0answers
31 views

Some books to bridge the gap before GR [duplicate]

I am extremely interested in GR, but somehow feel that the books I read are not really enough. Frankly, I find many question on this site and elsewhere completely bewildering, which makes me think ...
2
votes
0answers
54 views

Physical reasoning and mathematical problems [closed]

After reading The Mathematical Mechanic: Using Physical Reasoning to Solve Problems by Mark Levi, I was wondering if there there are other books (or papers) that use a similar approach to explore ...
3
votes
1answer
41 views

Resources to learn about the Higgs theory at undergraduate level

As part of my studies at university, I am doing a project that aims to understand the foundations of the Higgs Mechanism and to ultimately attempt to convey it to an audience in a non technical ...
1
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1answer
48 views

Defining creation and annihilation operators

Creation and annihilation operators can be defined in several different ways, some more general than others. We usually choose to denote by $a$ the annihilation operator and by $a^\dagger$ the ...
1
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2answers
99 views

How to understand “always create before we annihilate, not the other way around”?

On the book QFT in a Nutshell by A.Zee page 61 writes Always create before we annihilate, not the other way around. —Anonymous But in this Phys.SE question we are doing it the other way ...
0
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0answers
23 views

Limit Of Temperature [duplicate]

The last couple of days i have been thinking about temperature and heat and i thought : What happens to temperature if i continually supply a particle with energy? Then i thought at sometime i ...
2
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0answers
42 views

What topics should I develop complete concepts in before I begin the derivation of GR? [duplicate]

I had just been trying to understand GR but i just cannot understand where some of the formula of field came from. Apparently all those initial formula are from Newtonian physics so please anyone ...
2
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0answers
40 views

Which scientists have managed to name their laws/terms after themselves? [closed]

It would be pretty vain for someone to name a scientific law, unit, or term after themselves. "Newtons" as the name for the measurement of force, for example, was adopted in 1948, so I don't expect ...
0
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1answer
62 views

What is the best way to understand Physics? [closed]

What is the best way to understand Physics?
1
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0answers
50 views

Learning Roadmap to Mathematical Physics [duplicate]

Currently, I am a graduate student specializing in algebraic geometry. On the other hand, I have also become extremely interested in the mathematical physics. However, I am not sure what steps I ...
7
votes
1answer
106 views

Has the Nobel committee mixed up this years prizes for Physics and Chemistry? [closed]

The title of the question is tongue-in-cheek but the question remains: How does the Nobel committee delineate the fields when awarding work which is of such an inter-disciplinary nature. The chemistry ...
2
votes
4answers
107 views

Should I always include units at every step?

I've seen some controversy when solving physical equations on whether to put units all the time after I insert a numerical value to a variable with dimensions or to put the final unit at the last ...
1
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0answers
30 views

Guidance regarding research in Mathematical Physics [duplicate]

I am currently a Master's student in Mathematics. The main focus of my undergraduate programme was on Mathematics. However as a part of the course, I have done 8 Theoretical Physics courses(2 courses ...
0
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1answer
77 views

dark energy and expansion definition [closed]

I am trying to get a few key points correct regarding expansion and dark energy... Expansion: the Universe has been expanding continuously at different rates since the singularity that caused the ...
2
votes
4answers
345 views

Two soft questions about spin and the particle nature of electrons

How can we define spin as the spin of an electron around it's own axis if an electron is described by a probability cloud of finding an electron in a point in space? How does that probability cloud ...
1
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0answers
37 views

Electron/positron annihilation lines in astrophysics

I have a reasonable understanding of electron/positron annihilation, in that it is a collision between a pair of particles, one matter and one antimatter, that generally produces gamma radiation. ...
1
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1answer
25 views

Simple modelling of seasonal variation of temperature?

I'm really curious about this: What is the simplest (or most simplified) differential equation that accounts for the variations of temperature throughout the year at some point on the northern ...
0
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0answers
23 views

Appearance of the recomposition of a given spectrum? [duplicate]

Given a visible spectrum, i.e. a function from the set of visible wavelengths into the set of intensities, I would like to see the color having this spectrum decomposition. Question: How can I do ...
3
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2answers
90 views

Mathematical approximation to physics

Why is it often said that any mathematical theory is just an approximate theory of the universe? Wouldn't there be accurate mathematical structures repressing the physical entities of the universe ...
0
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1answer
57 views

Upcoming 'things to watch' in physics [closed]

What are the 'things to watch' in physics happening in the next year or so? E.g. A big astronomical event that happens only every n thousand years, or an experiment in particle physics which will ...
42
votes
6answers
7k views

What technology can result from such expensive experiment as undertaken in CERN?

I wonder what technology can be obtained from such very expensive experiments/institutes as e.g. undertaken in CERN? I understand that e.g. the discovery of the Higgs Boson confirms our understanding ...
2
votes
1answer
34 views

Acceleration format and interstellar units

Calculating with m/s$^2$ is very helpful when dealing with acceleration on the human range, as accelerating from rest at 4 m/s$^2$ for 3 seconds will give a velocity of 12 m/s. g is also a very ...
2
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0answers
126 views

Mathematical Prerequisites for QFT [closed]

I am curious about which areas of mathematics one should be comfortable with before learning QFT. I am familiar with the "learn-it-as-you-go" approach often advocated in physics, but would like to ...
0
votes
1answer
23 views

Mie theory “upper limit”?

I have read most often that objects experimented with in Mie theory are on a scale not much larger than the incident wavelength (usually a fiber of diameter $5$ microns with an incident wavelength of ...
0
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0answers
29 views

Resources on Solar Neutrino Physics

For a project I'm doing for an introductory Astrophysics course, I'm trying to understand the nuances of solar neutrino physics. However, most of what is said while explaining neutrino oscillations ...
0
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4answers
45 views

Can the term «shadow» pertain to anything else than light? [closed]

Can the term shadow pertain to anything else than light? Feel free to interpret this question in the widest sense possible.
0
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3answers
73 views

The study of the physical universe [closed]

If physics is the study of the physical universe, wouldn't that mean chemistry, biology, neuroscience, zoology, history, economics, sociology, etc, wouldn't they all be subfields of physics? I believe ...
2
votes
0answers
59 views

Really Struggling in electronics. What to do? [closed]

This is my first post so please go easy on me. Okay. Let me introduce myself. I am a first year undergrad CS student who has to study basic electronic course for one semester. As the title says, I am ...
1
vote
0answers
44 views

Doing theoretical physics after an engineering major? [closed]

Some background: I'm majoring in Electronics and Instrumentation engineering, but I want to pursue theoretical physics. I'm currently In my second year of undergrad engineering. I attend some physics ...
3
votes
2answers
118 views

Why are some variables summed infinitesimally and others aren't?

This is something that has been bothering me and I hope the title kind of makes sense. It may be a stupid question but please be gentle. My question is, let's say we have current: $$I=\frac{dq}{dt}$$ ...