Questions tagged [experimental-physics]

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

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1answer
13 views

How do I work out air and water speed from a measured static force?

This is a real question - not homework - I am NOT a student... How fast is the water going through my 140mm diameter propeller when my boat is pulling 12kg against the tree it is tied to? Water is ...
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ZEUS Uranium-Calorimeter

According to Wikipedia: In the ZEUS calorimeter neutral pions interacted with uranium atoms to produce slow moving neutrons which were captured by the scintillator and increased the hadronic signal. ...
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Jet Reconstruction: $k_{T}$-, anti-$k_{T}$ and Cambridge/Aachen in Comparison

In this paper, the following plot is shown: If we had had a perfect algorithm that would give us a perfect cone, would we see perfect circles in the $\phi-y$ plane that is shown, where $y$ is the ...
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Understanding Jet Clustering: Why is only $p_{T}$ used?

Let's only consider iterative jet clustering algorithms. Famous ones are the $k_{T}$ ($p = 1$), anti-$k_{T}$ ($p = -1$) and Cambridge/Aachen ($p = 0$) jet reconstruction algorithms. All these ...
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1answer
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Paul Dirac on Dimensionless Physical Constants and $\alpha\sim\frac{1}{137}$

Paul Dirac gave his viewpoints on the dimensionless constant (click to see the youtube video). For example, he mentioned the fine structure constant $$ \alpha\sim\frac{1}{137}. $$ It is not clear that ...
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Analytical expression for uncertainty in resonance frequency

I'm asked to write an analytical expression for the uncertainty in the ratio of the resonance frequency of some "string" to the mode of vibration, which works out to always be equivalent to ...
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1answer
26 views

Thin lens equation calculation does not match experimental value, why?

for an optics experiment I had to design a $2$-lens system to image a grating, the diagram looks like this: The focal length of both lenses is $15$cm, at the end of the system there's a camera ...
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What is the equation for calculating magnetic field for two coils when the currents in the coils have opposite orientation?

So I was wondering what the equation is to calculate the magnetic field when the two coils are separated by a distance d, with the currents in the coils in opposite orientation? Any help would be ...
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Formalizing the Askar'yan Effect

Wikipedia defines the Askar'yan Effect as... [The] Askaryan effect is the phenomenon whereby a particle traveling faster than the phase velocity of light in a dense dielectric... produces a shower of ...
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1answer
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My simple pendulum has a period about 1/3 what it should be

I'm a high school science teacher, my primary degree is in Physics, so I have a solid grasp of the background. I'm running into a strange issue with a pendulum lab I had my students complete. We're ...
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Scale bars (SEM-Zeiss)

I am using ImageJ to measure distances in an SEM image. The scale bar I'm using looks like this What is the correct distance represented by the scale bar? Is it line 1 or 2?
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Is Rubidium used in Photoelectric cell?

The question is pretty straightforward . I know that Potassium and Caesium are (famously) used for the purpose . Further Rubidium lies midway between Potassium and Caesium in s-block and hence a lot ...
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How (or where) to look up vapor pressure of a material at ultra-high vacuum pressure?

Is there a way to look up the vapor pressure of a given material (usually binary compounds or simply elements) at ultra-high vacuum (usually near $10^{-9}$ Torr). For example, if I want to know the ...
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71 views

How has physics been used to study mathematics? [closed]

Suppose, I have the differential equation $ \frac{d^2\vec{ r(t)}}{dt^2} = \frac{\kappa}{|r|^2} \hat{r}$ and I wanted to know what kind of vector would solve the above equation give some initial ...
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What does steam condensation for reuse mean in a steam turbine?

So I'm always confused how this LOOKS like when done. I imagine two ways: Sending the high-pressure hot steam in pipes that coil into and go out of the water tank. Here the steam loses its internal ...
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What does this experiment on light conclude?

Kleppner and Kolenkow pg 446 write, Suppose that light makes a round trip $A B A$ between two points $A$ and $B$ separated by distance $l$. The apparatus is moving through the ether to the right, as ...
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Physics experiment with sound [duplicate]

I am doing an experiment for a school project which consists of blowing into 6 different bottles to create different notes/harmonics. Each bottle is filled with different volumes of water to create a ...
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3answers
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Clean lab data set

In a experiment I have a set of values for position an time (t,x) but due to the lab conditions the set is a little noise (you know, limitations, I cannot have infinite precision, thermal noise, the ...
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1answer
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What is the working principle of a bamboo cannon in terms of energy physics?

A typical bamboo cannon consists of a large bamboo node or tube containing some water to which a little calcium carbide (or kerosene) is added. Bamboo cannon's popular in Malaysia, Indonesia, and ...
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48 views

Is it possible to obtain an IMUs (accelerometer+gyroscope) placement inside a black box through experiment?

So if I only have physical access to the exterior of a black box containing an IMU (Inertial Measurement Unit) sensor with 6DOF (3-axis gyroscope, 3-axis accelerometer) rigidly fixed to an unknown ...
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Can the word “doping” refer to controlling the Fermi energy via a gate field?

In the Integer Quantum Hall Effect with a fixed value of the perpendicular magnetic field, I believe that the filling factor $\nu$ which determines the Hall conductivity is experimentally controlled ...
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How do I find the focal point for one lens in a double lens system?

So I'm trying to construct something that will use the two lens, (1) and (2) where lens 2 is 4x bigger than lens 1. The point of this thing will be to heat the small plate at the end of the cylinder ...
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1answer
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Can particle spin actually show quantum effects like the disruption of measurement?

I was going through a quantum objects course on brilliant.org, a few things have been bothering me and though I searched A LOT I can't seem to find any answers. For one, the course implies that a ...
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42 views

Could we have the same speed in water with two beams of light and matter?

Could we have the same speed in water with two beams of light and matter? Or the speed of light of the light beam and matter beam both equal 225,000,000 m / s in water. the photon goes at the speed of ...
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Experiments to show that a voltmeter measures energy per unit charge

In "Physics for the Inquiring Mind" by Eric Rogers, an experiment is described to show that a voltmeter (considered as a black box) indeed measures work done per unit charge by measuring the ...
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1answer
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Measuring mass of an object in outer space

How do (or will) people measure the masses of objects in outer space? (Like in ISS).
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Zero Error of Screw Gauge

Consider a screw gauge of 50 divisions on the circular scale. Till now I have used the following method to account for zero error in it. If $x^{th}$ division on the circular scale coincides with the ...
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37 views

Relating the Minev et al experiment to Brun QTT survey

I have been studying from many angles the groundbreaking/now renowned Minev et al experiment: To catch and reverse a quantum jump mid-flight [1]. I have many questions on this complex/intricate setup ...
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155 views

Has the double slit experiment with classical projectiles ever been performed?

I was wondering if the double slit experiment with mascroscopic objects has ever been tried. In any course of quantum mechanics, a way to introduce quantum effects is to introduce the double slit ...
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1answer
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Does boron trifluoride have to be replaced in a proportional chamber detector with ${\rm BF}_3$?

Does boron trifluoride have to be replaced in a proportional chamber detector with ${\rm BF}_3$? Boron-10 reacts with a neutron through alpha decay $$^{10}{\rm B}+{^1}n \rightarrow {^7}{\rm Li}+{^4}\...
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The nature of measurement in Quantum Mechanics

I am extremely sorry for my silly question but I am really struggling on the nature of measurement... If we have a SG experiment which measure spin of an electron in z-direction, but not recording the ...
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1answer
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Rate of evaporation of water vs temperature. Where can I find data?

The story If there is an easily understandable problem that fascinates me compare to apparently how hard it is to model and solve accurately, and how little it has been studied, the time to cool down ...
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1answer
42 views

Electromagnet with a hollow core [closed]

For a project, i want an electromagnet with a hollow cylindrical space of 60mm(something Iike as shown in attached image) which can produce a force of 1000N inside this hollow space on a ferromagnetic ...
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Deflection angle of an alpha particle when colliding with a stationary nucleus

Is it possible to calculate the deflection angle of an alpha particle after colliding with a stationary nucleus with atomic number,Z,without actually knowing Z or for that matter without knowing the ...
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1answer
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Does the lack of evidence for proton decay really rule out the basic grand unification theories?

Grand unification theories (GUT), such as $SU(5)$/$SO(10)$/SUSY variants, suggest proton decay. The lack of observational evidence for proton decay is supposed to rule out basic GUTs, at least for the ...
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Frequency sensitivity of gravitational wave interferometer with its armlength and with mass of the mergers

To the best of my knowledge, LIGO is capable of observing gravitational waves (GW) from stellar mass black hole (BH) mergers but not mergers of supermassive black holes. In order to detect the latter ...
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Are 'Terahertz-pulse lasers', like, 'Terahertz time-domain spectroscopy' and such, of Terahertz-frequency or trillion-pulses-per-second?

From Phys.org: Light-controlled Higgs modes found in superconductors; potential sensor, computing uses. The mode can be accessed and controlled by laser light flashing on the superconductor at ...
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What is a 'multi-energy band' superconductor?

From Phys.org: They write that in lab experiments they've found a short-lived "Higgs mode" within iron-based, high-temperature (but still very cold), multi-energy band, unconventional ...
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How is the ground state energy of the helium atom experimentally determined?

According to Wikipedia the ground state energy of the helium atom is −78.95 eV. From the little I understood of spectroscopy, I believe that allows us to measure the differences in energies between ...
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What experimental evidence is there for quarks constantly changing colors?

In other words, why is it believed that the quarks are constantly changing colors? This question answers why theoretically but I'm curious what experimental observation prompted this theoretical piece ...
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329 views

Is the recent Nature paper by Minev et al. evidence of new physics?

Ok the title might be slightly clickbaity. A better one might be "Why isn't the recent Nature paper by Minev et al. evidence of new physics?", but I didn't want to make too many assumptions ...
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1answer
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Help with at home experiment for physics degree: how to suck water up a tube

I'm doing an at home experiment for my physics degree due to covid restrictions, and I need to suck water up a vertical tube. I would really appreciate any equipment recommendations or other advice ...
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1answer
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Using flat or thin glass for Surface Plasmon Resonance

SPR is typically created using prism with a thin gold film on the other end. I was wondering if I cut the triangular prism (using a glass cutter at home) into thinner slices, would this have an impact ...
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How do we know if quantum black holes were made in the LHC? [duplicate]

CERN claims that there's a possibility of formation of tiny 'quantum' black holes inside the LHC. So, if that ever happens (or have already happened), will the observers ever know about it? Can in any ...
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Compton Scattering Contribution to Xray Spectrum background

I know the phenomenon, the experiment, and the compton X-ray shift.But I am wondering if compton scattering is essential contribution to Xray background. How is Compton scattering configured from Xray ...
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Isotopic separation and circular motion

I have read in a textbook of an high school (I not know) that exist a centrifuge with isotopic separation of the radioactive material very similar to the centrifuge for hematocrit to separate the ...
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How to interpret s amd p polarisation in terms of circular or elliptical polarisation?

I am confused between s,p polaroised light and circular polarisation. Does circular polarisation mean a phase difference of 90 between s and p components ? Do help.
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1answer
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How might one design an infinity balloon without an appropriate material

A while ago, I was working on a idea I had. I wanted to design a hypothetical sail that was effectively weightless. Why I wanted a 'weightless' sail is a rabbit hole that I'm not going to get into but ...
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1answer
38 views

Collect (almost) all light from a point source

If I have a point source of light which I can surround with a curved mirror/lens. Is there a well known technique to try to collect all the light from the point source and direct it onto a ...
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1answer
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Can you make a multistage roots vacuum pump quieter by putting something on the exhaust?

The multistage roots pump in our lab is really loud, currently, there is nothing on the exhaust, as we are just dealing with air. Does somebody know a way to make the pump quieter (i already proposed ...

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