Questions tagged [experimental-physics]

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

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Dipole source in lithography

What type of source is the dipole radiation?Is it coherent? I studied that using dipole source increases the image contrast in lithography,How is it possible?
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Diffraction of a dipole source through $N$ equally spaced slits

For $N$ equally spaced slits, what does the diffraction pattern look like for a dipole source?
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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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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
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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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4answers
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What is the experimental evidence for creation of a gravitational field by electrons or other leptons?

What experimental evidence do we have that leptons (electrons, muons, tau leptons, neutrinos) create—rather than merely respond to—a gravitational field? General relativity (GR) predicts that all ...
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What characterises a rapid delay line?

When reading into Adaptive Sampling for Terahertz Time-Domain Spectroscopy and Imaging, it is stated: "In general, the advantage of a rapid delay line is high repetition rate, and the SNR can be ...
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Photocell current vs light intensity calibration

In Lab experiment, to verity the inverse square radiation law, we observe the solar cell current changes with the distance from the light source. How would we relate the solar cell current and the ...
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What changes this black box's output? [closed]

We have a theoretical black box with no obvious inputs and outputs a value. For the sake of imagination, it's a literal black box with a digital counter on one side. We want to figure out what causes ...
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The sources of error in a diffraction grating experiment [closed]

In a diffraction grating experiment, what can be the sources of error and also what effect do these sources have on the unknown quantity (for example, wavelength) in the experiment?
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Why the person at back on a two wheeler feels hard to listen to sound of the person riding

Situation Today while I was riding a two wheeler(activa) and was talking simultaneously my sister behind me complaint that she wasn't able to hear anything I was saying but I dont get it when we are ...
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Experimenters regretting throwing away data

Modern experiments, especially in fields like particle physics, often collect far more data than they can process and save. Similarly, I can imagine that historical experimenters were limited by how ...
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Why and who has established that $1\, cal \equiv4.186\, J$?

At one time, it was mistakenly believed that an object contained a certain amount of 'heat fluid' that could flow from one body to another. of 'caloric fluid' that could flow from one body to another. ...
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Can we use curved spacetime to measure the one-way speed of light?

This is a duplicate of Measuring one-way speed of light with gravitational lensing and Measuring the one-way speed of light with a black hole? The idea is to shine a beam of light from a clock towards ...
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What experiment confirms $\mathbf{J}^2 = \hbar^2 j(j+1)$?

I learned that if we measure the spin angular momentum of an electron in one direction $J_z$, we get $\pm \frac{1}{2} \hbar$. But if we measure the magnitude of the angular momentum $\mathbf{J}^2$, ...
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1answer
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What error to use on measurement?

I have a question regarding errors which has always stumped me. It's what error should be quoted on a measurement. Let's say I have a very simple situation with a force on a spring. For $$ F = kx$$ ...
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How does keeping a temperature probe still in an electric kettle affect its temperature readings?

Greetings Physics Stack Exchange, I hope this question is adequate to this community as it is my first post. For my physics lab report, I decided to measure the Specific Heat Capacity of NaCl at ...
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1answer
37 views

How to dilute 5000 ppmvol of $\mathrm{CO}_2$ to obtain 250 ppm with a fluxmeter?

My problem is that I have a tank, containing $\mathrm{CO}_2$ at 5000 ppmvol, Oxygen $21\%$ vol and Nitrogen the rest, connected with a mass flow controller (flux max at $150$ ml/min). And I have a ...
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1answer
60 views

Vacuum polarization and initial state radiation correction for the cross section

I saw that the experimental Born cross section measured for (e+e- -> Hadrons) for positron-electron particle physics experiments such as the (BESIII or BaBar experiments) is corrected by initial ...
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Order parameter

Order parameter: Suppose, for simplicity, that the molecules composing a nematic or cholesteric liquid crystal are rigid and rodlike in shape. Then we can introduce a unit vector v") along the ...
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1answer
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Does capillary action work in moving bodies?

If I were to have a capillary tube on a moving body such as an ocean buoy, would it still be able to draw the liquid upwards? Or would the turbulence slow down or stop capillary action?
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How do we obtain matter-lambda curve?

I have 400 supernovas type Ia's distance modulus and its error and redshift. how can I obtain an elliptic curve like the one in image for my datas? where did that elliptic came from?
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It isn't very easy to read DeepMind's “mind”, is it? [closed]

Recently the DeepMind supercomputer achieved the ability to predict protein structures to a pretty commendable level of accuracy. To get "insight" from any physical phenomena, experiment ...
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How to read voice clips off a glass plate?

This question comes from the context of two great works on popular science, one a book on cognition and artificial intelligence Gödel, Escher, Bach (GEB) And the other a fictional TV series Fringe. In ...
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What experiments have been done so far to measure that the speed of light is the same in all reference frames, even with relative velocity?

What experiments have been done so far to measure that the speed of light is the same in all reference frames with relative velocity between them, and that it is independent of the velocity of the ...
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Does potassium hydroxide etch steel?

Potassium hydroxide is a good etching agent for glasses. If the sample is laser processed, then the etching rate is much more faster. I want to use stainless steel (because of its good thermal ...
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Why is the spectrometer so big in KATRIN experiment?

I've been studying KATRIN experiment for a popularizing science project and I was wondering, why is the spectrometer so big ? I mean the thing is so huge that they had to carry it over 8000km on the ...
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1answer
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iPhone images of lights shows black bars. Double slit experiment?

To start: I know I'm pushing the boundaries a little bit, given Stack Exchange's strictly academic context. This question isn't really too academic, so I understand if it needs to be taken down. The ...
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Uncertainity of measurement in both function and variable

I have done a measurement of two physical quantities (let's call them x and z) at the same time and I have repeated the measurement five times. I have calculated the standard deviation and the ...
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2answers
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Loop Quantum Gravity falsified?

In the Wikipedia article "Loop Quantum Gravity" one can read ESA's INTEGRAL satellite measured polarization of photons of different wavelengths and was able to place a limit in the ...
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How is it possible to do spectral analysis of a light source?

I have a big book published many years ago by NASA which is page after page of numbers, the numbers being the irradiance of the sun at particular wavelengths. I wonder how such a book could be ...
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Rocket Trajectory (launching it vertically) [closed]

I don't have a camera that can produce a video at 240fps and i my physics experiment i am trying to find the maximum height reached by a water rocket. My question:- Can i use my iphone 11, that has ...
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What does the electric field look like emanating from a tesla coil?

The magnetic field from a wire wraps around it. The direction depends on the direction of the current. This means that the magnetic field passes through the center of the secondary coil, then out ...
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Practical books about lasers

Can someone point me towards some good books about laser from a practical/experimental perspective (maybe even a review paper). Most books I found spend a lot of time going through derivations and ...
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3answers
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Is there a theoretical or technological limit for arbitrary precise measurement of the position of a point particle in QM?

I have read this question: Where pglpm says: So the answer to your question is that in a single measurement instance we actually can (and do!) measure position and momentum simultaneously and with ...
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Gamma detector Resolution

I read that the resolution of the gamma-detector $\frac{∆E}E∝E^{-\frac12}$ But it didn't mention the derivation, I am interested in the derivation, any hint will be appreciated. Best Wishes Rashed ...
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Millikan oil drop experiment

I had a question about the Millikan Oil drop experiment. I did the experiment for my physics class where we had to determine the voltage that would make the droplet stationary. We did this ten times, ...
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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 ...
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1answer
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Does sound take form of the medium it travels through?

I’ve always wondered how striking a tuning fork and holding the Struck fork next to a cylindrical body with an adjustable length can yield an ideal length of that body which produces the loudest sound....
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When is bunjee jumper's acceleration maximum [closed]

This video talks about the point where the acceleration of bunjee jumper is maximum Veritasium. "When Is A Bungee Jumper's Acceleration Max?", YouTube, May 25, 2011. I approached it by ...
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Can we transfer part of the angular momentum of light to mechanical objects? [duplicate]

Light or electromagnetic fields, in general, carries angular momentum. Is it possible to transfer part of its angular momentum to a mechanical object and make it rotate? In that case, is it possible ...
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Does the new measurement of the fine structure constant rule out string theory?

I am no expert in either string theory or experimental physics, but I was reading this article by Nature, where it is quoted: This result confirms, for example, that the electron has no substructure ...
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Does PIXE only measure external composition?

When performing X-ray spectroscopy, say with PIXE, do atoms inside the metal have vacancies induced or only the outer layer? For example, a quarter has a shell of 75% copper and 25% nickel, but a bulk ...
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Applied load on a Stapler [closed]

I'm trying to do a finite element analysis on a stapler I created in Solidworks. In order to do this I have needed a set load being applied to the top of the stapler. Any ideas on how I would go about ...
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2answers
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What experimental techniques could be used to search for higher (macroscopically occurring) spatial dimensions?

We live in a a universe with 3 spatial dimensions and 1 time dimension. However, if we lived in a universe with 4 or more spatial dimensions, under the right conditions (such as a general lack of ...
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The critical point of gold — how did they measure this?

I was looking up something far more mundane and noticed this: https://en.wikipedia.org/wiki/Critical_point_(thermodynamics) ...
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How would you build a device to measure $L^2$ (angular momentum squared) of a particle

The formalism of Quantum Mechanics uses angular momentum operators such as $L_x, L_y, L_z$, and $L^2$. The quantities corresponding to $L_x, L_y, L_z$ can be measured using a Stern-Gerlach apparatus, ...

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