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Questions tagged [experimental-physics]

For questions about design, process, data, or analysis of experiments and observations.

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Why do flux qubits have to be micrometer-sized?

Flux qubits are made using micrometer sized Josephson junctions. They exploit superconducting properties to create and interfere with the magnetic flux between them. My question is that I've seen ...
OrangeCalx01's user avatar
11 votes
0 answers
315 views

Experimental Hopf fibrations

Recently I read a paper where the authors experimentally constructed a Hopf fibration - that is, they created a quantum system where the nematic vector field of the system had a non-zero Hopf ...
Mark B's user avatar
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Experimentally diminishing random errors for low wavelength UV observations

Part of the work that I do involves observations of solar low wavelength UV observations, specifically UV-B and UV-A II (up to 340nm). I have noticed that when I observe responses on a CCD or CMOS ...
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8 votes
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173 views

Large Hadron Collider 2015 upgrade, what may we discover?

I realise that the initial answer to my question that may come to mind is, "we don't know yet, obviously" But my question is hopefully not opinion based. For example, does this upgrade have a ...
user avatar
8 votes
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261 views

Is there a cheap way I can do a Bell inequality experiment?

My work is almost completely theoretical/computational. But I'd really like to do a Bell inequality experiment just so I can personally see this (the best way to learn something is hands-on, right?) ...
Nick's user avatar
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8 votes
1 answer
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Does this method of predicting the ratio of translational diffusion coefficients for a sphere and a sheet, work?

Imagine that I have a spherical particle of molecular weight $M$, volume $V$, and some experimentally observed center-of-mobility translational diffusion coefficient $D_{sphere}$ in water. I take ...
user avatar
7 votes
0 answers
276 views

What is required for a minimum viable Bell test experiment at home?

My objective is to create a tabletop Bell test experimental setup generating data of suitable quality for undergraduate education or satisfaction of personal curiosity; remaining free from loopholes ...
ahelwer's user avatar
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6 votes
0 answers
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Does 5G affect your physics experiment?

Our institution wants to lease a nearby roof for a 5G mast. Has anyone experienced the installation and operation of telecoms infrastructure - particularly 5G - significantly affecting physics ...
NLambert's user avatar
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6 votes
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Experimental time-series for quantum particle-in-a-box or simple harmonic oscillator?

I would like to see experimental results for repeated measurement of a single-particle, quantum system that is approximately either particle-in-a-box or simple harmonic oscillator. If particle-in-a-...
Brick's user avatar
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6 votes
0 answers
336 views

How to cleave a perovskite single-crystal in vacuum?

I am trying to cleave the lead-halide perovskite in vacuum to study its intrinsic electronic properties using photoelectron spectroscopy, since it is difficult to remove surface adsorption without ...
Zhanhao Hu's user avatar
6 votes
0 answers
66 views

Sterile (4th) neutrino and cosmological bound

Recent results by MicroBoone seems to give support to old LSND experiment in favor of a fourth neutrino (sterile). How does it fit with the current cosmological bound for neutrinos?
riemannium's user avatar
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6 votes
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How can I estimate meta-uncertainty?

A type A uncertainty estimate is derived from repeated measurements. For example, I may estimate the uncertainty on a measurement by repeating the measurement $N$ times and then calculating some ...
gerrit's user avatar
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On the right-angled fork track of alpha particles

In high school we were told that the idea "alpha particles are actually helium nuclei" came from observing the right-angled fork track, produced by placing an alpha source in a diffusion cloud chamber ...
Jonathan Mok's user avatar
6 votes
0 answers
224 views

Measuring the Dirac field

If the Dirac field $\psi(x)$ is to the electron as the Electromagnetic field is to the photon, why is it that we can measure the Electromagnetic field, whereas the Dirac field we cannot?
DaYu1729's user avatar
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Experimental tests of Cluster Decmposition

How tight are experimental and astrophysical tests on whether Cluster Decomposition is satisfied at various space-like separations? Is there a review paper or a standard reference on the question? I ...
Peter Morgan's user avatar
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5 votes
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How do you weight a chi square for uncertainties in $x$ and $y$ (different units)?

So I have experimental data for energy vs angle with uncertainties in both the $x$ and $y$ direction for every point. I am comparing this to a known curve/data points. Is it possible to calculate a ...
Billy123's user avatar
5 votes
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375 views

Lightning through helium gas

Assuming that some distant planet had an atmosphere of helium and(due to extremely cold temperatures) a "water cycle" of neon, what would happen if the theoretical neon clouds acted in a ...
Jack Foisy's user avatar
5 votes
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169 views

How do measurements of $G$ account for variations in the local gravitational field?

One of the notable discrepancies of modern physics is the current disagreement of measurements of the gravitational constant $G$, well beyond reported uncertainties (and agreeing only to about 1 part ...
tcamps's user avatar
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1 answer
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Do a floor tile or dry sand conduct electricity?

If you touch an electric wire while standing on a ground made of soil or floor tile, you will get electrocuted. So, electricity passes through it. Right? Shall I conduct an experiment by passing ...
shameem's user avatar
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5 votes
0 answers
263 views

Quantum (spin/thermal) Hall v.s. (Spin/Thermal) Quantum Hall effects

Are the following concepts defined correctly, as I understand: Quantum Hall effect is a quantum-mechanical version of the Hall effect, observed in two-dimensional electron systems subjected to low ...
wonderich's user avatar
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5 votes
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123 views

Is it caustic reflection or hyperbolic projection?

actually last night I noticed a strange form of light rays on the wall of my room which were reflected off a CD. Here is its photo: Please let me know what is it exactly? A caustic projection or ...
Twiching Frames's user avatar
5 votes
0 answers
155 views

How can one confirm creation of magnetic graphene?

Recently my high school physics teacher contacted me looking for an expert to ask about this situation. I am paraphrasing his correspondence below: I just had a a student accidentally create magnetic ...
rschwieb's user avatar
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Experimental results regarding non-extensivity in small systems

From a statistical mechanics point of view, the extensivity of thermodynamics arises from the fact that we can neglect interaction terms in the Hamiltonian. This allows us to infer that when we put ...
N. Virgo's user avatar
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Did Penzias and Wilson need such a large horn antenna to discover the CMB?

Penzias and Wilson discovered the 2.7K Cosmic Microwave Background (CMB) Radiation using a 6 meter horn antenna, along with a cryogenic low-noise detector measuring at 4 GHz: http://en.wikipedia.org/...
user38274's user avatar
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Is there precision experimental evidence for Furry's theorem -- that only even degree VEVs are non-zero?

Is there precision experimental evidence for or contradicting Furry's theorem -- that only even degree VEVs are non-zero, specifically for the EM field?
Peter Morgan's user avatar
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4 votes
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77 views

Question about spin-$½$ particles

Spin-½ particles needs to rotate 720º to return to its original state. If you rotate it 360º, its state will become opposite, for example $\left| ↑ \right>$ to $-\left| ↑ \right>$. This is my ...
Max0909's user avatar
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4 votes
0 answers
58 views

How can i find the value of Planck's constant using Black body radiation?

I'm working for a physics project for Highschool, and i'm currently thinking about using black body radiation to measure Planck's constant. I know there is an option using the photoelectric effect but ...
Johnny's user avatar
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4 votes
1 answer
114 views

Is there any experiment to check discreteness of space?

This article from 2015 seems to suggest that there will be experiments to check discreteness of space: If space-time is discrete, there should be imperfections. And even if rare, these imperfections ...
Cristi B's user avatar
  • 395
4 votes
0 answers
98 views

Principles and methods of measuring the orbital angular momentum of $\rm H$-atom

When we talk about the orbital angular momentum (OAM) of the $\rm H$-atom, we mean the eigenvalues $l(l+1)\hbar^2$ of the OAM operator of the electron $\hat{L}^2$ defined from its classical ...
Soumita's user avatar
  • 577
4 votes
0 answers
61 views

Splashing of Falling Sphere does not depend on Sphere Size

I am reading through a Nature article where the authors study whether a sphere dropped from height into a body of water has enough velocity to splash and form the classic effect where air is pulled in ...
Tom's user avatar
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4 votes
2 answers
156 views

Operationally, how do I choose between measuring position or momentum?

First a simple example to illustrate the essence of the question: If we have a spin half particle in the $S_z+$ state and if one wants to choose from either measuring $S_z$ or measuring $S_y$, which ...
Varun Premkumar's user avatar
4 votes
0 answers
133 views

Experimental challenges of increasing the size of a Bose-Einstein condensate

My question is partially inspired by this question. I know that BECs have been created whose side lengths are on the order of microns, while others have managed to make a side length of approximately $...
user85503's user avatar
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4 votes
2 answers
133 views

Who knows experiments on wave packets spread?

I'm looking for some experimental evidence of quantum wave packets spread to propose to my students. I notice that a huge attention is devoted in books to the theoretical frame, while almost nothing ...
Umberto's user avatar
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4 votes
0 answers
1k views

What is the third peak in the spectrum of Sodium-22?

I collected this spectrum from a sodium-22 sample in an instructional laboratory. The sample was set in front of a germanium detector which sends a signal into a pulse height analyzer and plots a ...
Diffycue's user avatar
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4 votes
0 answers
408 views

How can I test whether my cloud chamber is supersaturated or not?

Me and my friend are building a diffusion cloud chamber for a school project. In stead of using dry ice or a peltier, we have used the phase changer of a freezer to cool our plate. We were able to ...
Sebas Smits's user avatar
4 votes
0 answers
160 views

What experiments confirmed Poynting's Theorem?

Actually, I have two related questions. The fist is the above question. The second is, what experiments confirmed that $\varepsilon_0\left(\frac{E^2}{2} + c^2 \frac{B^2}{2}\right)$ is the ...
prokaryoticeukaryote's user avatar
4 votes
1 answer
164 views

How is Spin experimentally determined?

I know what spin is and how theories determine it for particles. What I don't understand yet, is how people, through experiments and data analysis or whatever, reach to confirm/say that the $X$ ...
Les Adieux's user avatar
  • 3,705
4 votes
0 answers
107 views

Experimentally realizable states for bosonic quantum fields

I would like to know which type of quantum states of a bosonic field, that have an explicit analytical expression as vectors/density matrices in a symmetric Fock space, can be prepared in an ...
yuggib's user avatar
  • 12k
4 votes
0 answers
83 views

How can the effects of temperature be accounted for in-situ electrical resistance corrosion monitoring?

In reading the Berkeley Lab's article Rust Never Sleeps, where research is underway investigating the use of iron oxide rust as a photovoltaic, they state: Rust – iron oxide – is a poor conductor ...
user avatar
4 votes
0 answers
211 views

How to express Allan variance without neglecting clock drift

Allan variance, $\sigma^2[ \tau ]$, or its square root (Allan deviation, $\sigma[ \tau ]$) is a quantity (as function of parameter $\tau$) which is said to be a measure of (or related to) "stability ...
user12262's user avatar
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4 votes
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218 views

Baryonic density in collision experiments

Does anyone know any way of estimating the net baryon density in collision experiments, e.g. in LHC, RHIC, or the upcoming ones at GSI-FAIR? I have comes across many hand-waving arguments, sample - ...
299792458's user avatar
  • 3,184
4 votes
2 answers
102 views

What's the best way to measure a magnetic field?

I work in a physics lab. ...
DarkBulle's user avatar
  • 197
4 votes
1 answer
261 views

Quantum fluctuations in a classical domain?

"In the presence of chaos, even small fluctuations (including quantum fluctuations) can be amplified to produce large uncertainties in later behavior"(https://arxiv.org/abs/gr-qc/9210010) Is ...
Nogueira's user avatar
  • 5,794
3 votes
2 answers
86 views

What does it mean to probe a certain energy scale?

For example, what does it mean that the LHC probe the electroweak scale, $M_{EW} \sim 10^3 GeV$? Also why is this energy called the electroweak scale?
TaeNyFan's user avatar
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3 votes
0 answers
57 views

Observed frequencies of a drum versus mathematically predicted frequencies

I built a small circular drum in order to compare the actual resonant frequencies versus the resonant frequencies predicted by modeling it as a circular membrane obeying the wave equation with fixed ...
graviton's user avatar
3 votes
0 answers
63 views

What is the meaning of "Dual Accuracy" on this datasheet?

I'm trying to determine the uncertainty in some of my measurements, and one of the variables I measure is temperature, using a Tenma 72-7715 thermometer. I looked up the datasheet to find the ...
probablysid's user avatar
3 votes
1 answer
78 views

How to experimentally determine the relation between magnetic moment and spin angular momentum of a quantum particle?

In quantum mechanics the spin magnetic moment in terms of angular momentum is given by $\mu=g\frac{e}{2m}L$, where $g≈2$ Now the question I was wondering, how do you determine this with experiments? I ...
Joel Järnefelt's user avatar
3 votes
0 answers
76 views

Quasiparticle interference experiment - why backscattering is usually dominant?

I am reading Avraham et. al (2018) Quasiparticle Interference Studies of Quantum Materials about quasi-particle interference (QPI) experiments. In the simplest case where they use QPI to study the ...
ocf001497's user avatar
  • 766
3 votes
0 answers
1k views

Relationship between resonance frequency of a cup and amount of water filled

For a science project I chose to investigate the relationship between the resonance frequency of cups and the amount of water filled in it. I filled the cup with 10 grams of water each time, and used ...
David305's user avatar
3 votes
1 answer
239 views

What is the reason for keeping the mercury bulb in a Callendar's compensated constant pressure thermometer in an ice bath?

The following statement explains the main source of error in a constant volume gas thermometer: Figure 1 : Constant volume gas thermometer In constant volume gas thermometer, the gas in the capillary ...
Vishnu's user avatar
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