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Questions tagged [experimental-physics]

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

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How does the CDF II $W$ boson mass measurement position itself relative to previous measurements?

The paper High-precision measurement of the W boson mass with the CDF II detector compares their results to the results of previous measurements in Fig. 5. While they show this visual comparison, ...
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Which one is measurable - Proper or Coordinate velocities?

When we measure the velocity of a particle, are we measuring its proper velocity or coordinate velocity. Also, when we do particle physics experiments, how do we measure the four momenta of a particle?...
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1 answer
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Do twisted pair wires create a helical shaped magnetic field if parallel electrical currents are run through the two wires?

I would like to know if the shape of the magnetic field around twisted pair insulated wires will be a helical shaped magnetic field if both wires have parallel electrical current running through them. ...
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What information we can obtain from total transverse energy and transverse momentum plots on particle physics

I am working on particle physics simulations and making some plots for which the purpose are not yet clear to me, as I am a novice in this field of study. To make my doubts clear, let's consider an ...
dumb physicist's user avatar
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How are uncertainties of the quantum state/wavefunctions themselves modeled?

This question might be confusing so let me try to clarify this carefully. The wavefunction is a tool that allows us to calculate probability distributions that model uncertainties. Thus makes sense. ...
Maximal Ideal's user avatar
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Reliable sources for scientific papers [closed]

I would like to know if there is a chance for self-taught person to get evaluated and accepted over scientific physics paper and experimental proof. If it so where can I apply?
Audrew's user avatar
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How many distinct phonon branches will I see for 3 atoms in the unit cell, along the [100] direction?

Silicon (Si) crystallises in the fcc cubic structure with two atoms in the primitive unit cell. How many acoustic and optical phonon branches does it have? How many distinct branches in the ...
Despaxir's user avatar
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Wave Experiment Method

Hello I am conducting an experiment to see how the tension, given by a hanging mass, affects the resonant frequency of a string. I would like to conduct 3 trials at 5 different tension forces/weights. ...
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Plausible explanation for anomalous plasma antenna time difference of arrival?

Consider the below-pictured time difference of arrival system consisting of two plasma antennas* with opposing DC bias. Samples of time difference of a 100MHz signal are taken as the TDOA system is ...
James Bowery's user avatar
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1 answer
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Books on physics about connection between experiments and theory

In relation to physics I would like to know, at least at some comfortable level, the link between experimentation and knowledge, this latter means the way that the results of experiments are ...
4 votes
2 answers
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Experimental constraints on time evolution of quantum states

We have so many experiments on quantum systems; many of those regard superposition principle; tests of probabilities; entanglement; quantum communication protocols; and others are related to ...
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What does 0 volts mean for a Van de Graaf generator?

I am trying to understand how two different definitions of zero-voltage reconcile in the experimental setup of a Van de Graaf generator, or at least how I understand that it is being described. ...
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3 votes
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Measurable effects of the global structure of the SM

It is known that the Lie algebra of the SM is $$ \mathfrak{su}(3)\oplus \mathfrak{su}(2)\oplus \mathbb{R}\,, $$ so that the Lie group is $$ G_{\text{SM}} = \dfrac{SU(3)\times SU(2) \times U(1)}{\Gamma}...
Gabriel Ybarra Marcaida's user avatar
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Machine learning in High energy Physics [duplicate]

Hello I'm undergrade student and recently I notice this application of machine learning, any book about it to understand more about it?
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Sources of error in experiment about the specific heat capacity

I have done an experiment about finding the specific heat capacity of a piece of metal. The experiment was done like this: The metal was weighed and then placed in boiling water until it reaches $100\...
UponTheAbyss's user avatar
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Wavelength Shift After Single Mode Fiber

In an experiment, we are trying to transmit a monochromatic laser through a single mode fiber. The specific desired wavelength is crucial and, therefore, should not be shifted. However, the wavelength ...
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Shockley Equation works better at higher temperatures

I have been doing some work as part of my undergraduate labs, and currently, the experiment is to determine the constant $e/k_B$ from the I-V response of a germanium PN junction. However, I've ...
MrStealYourFrog's user avatar
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How to find the image field of a Gaussian beam impinging on a positive lens? I am trying to calculate the impulse response and find the image field

How to get the image field for the setup in the following question , where a Gaussian beam is incident on a positive lens with focal length f z0 and z1 are the object and image distance? Can anyone ...
condensedvaddi's user avatar
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2 answers
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Would placing sand bags over the top of a car's strut housing reduce the jarring impact felt when the car hits a pothole? [closed]

I live in an urban area where many of the streets have pot holes and some of these streets have some very large and deep potholes. I have been wondering lately if it would be worth the effort to try ...
user57467's user avatar
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Which method of laser diode operation is less likely to cause mode hopping: constant current or constant power?

If a laser diode is uncolled and operates in a CW mode then which method of operation is less likely to cause mode hopping: constant current or constant power?
Jimski's user avatar
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Why does the liquid used in Millikan's oil drop experiment need to have zero viscosity?

My teacher said that the viscosity of the liquid used in Millikan's oil drop experiment is ideally zero. But why is that? What advantage does having zero viscosity have in the experiment?
Anish Shrestha's user avatar
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How to condition an STM tip?

I am starting work on an atomic force microscope and a scanning tunneling microscope and I wanted to ask for advice. How to proceed to get the sharpest tip and therefore the best resolution?
physics enthusiast's user avatar
1 vote
2 answers
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Image of an electron

Suppose we are trying to see the image of an electron with a microscope. Is it possible? And if it's possible then what do we see? A point at a time, or a blurry spot, or something else?
Users's user avatar
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An instrument for sensitive time interval measurements?

I had the idea to do an experiment at home that would let me calculate the air resistance. $F_{net} = m.a = m.g - f_k$ (kinetic friction), in the case of free fall, so I thought I’d drop an object of ...
jazzblaster's user avatar
2 votes
1 answer
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Which evidences do we have that general relativity works at large scales?

Recently I've been reading Pedro Ferreira's SciComm book The Perfect Theory: A Century of Geniuses and the Battle over General Relativity. At one of the last chapters, which discusses modified ...
Níckolas Alves's user avatar
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To understand relativity in time with time dilation experiment

The time dilation experiment involves two frames in relative motion, let one at ground and other at train with velocity V. The light clock runs faster in rest frame, as seen by an observer A at rest ...
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3 votes
1 answer
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How is my hot plate inside an aluminum-lined styrofoam box not violating the laws of physics?

I've constructed a 25cm x 25cm hot plate out of an aluminum plate with flat nichrome wire under it as a resistive element. I blackened the top with a pitch black spray paint, and placed it at the base ...
Cloudyman's user avatar
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Plotting curves of diode current against temperature

I have done I-V measurement at different temperatures on a diode, now I am trying to plot the $I_D$ vs temperature curve but varying $\eta$ (the ideality factor). I am not sure of the procedure though....
Aydin's user avatar
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2 votes
3 answers
231 views

Experimental status/test possibilities for baryon number conservation in LHC?

Violation of baryon number is hypothesized e.g. for baryogenesis (more matter than antimatter from Big Bang) or Hawking radiation (baryons -> black hole -> massless radiation) - quite extreme ...
Jarek Duda's user avatar
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Pressure at tail end of a water pipe

I was wondering about what is the pressure at end B based on these requirements: the flow velocity through the pipe is vcon(m/s) and flow rate is q(m^3/s), no requirement for delivery pressure at B, ...
manuel martin's user avatar
4 votes
1 answer
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How do materials scientists find and make candidate materials?

When searching for new materials that might exhibit interesting quantum effects such as superconductors or topological insulators, how do experimental physicists go about the process of making ...
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Positioning a piezo stack along the optical axis

I'm having a question related to experimental physics. I need to move an optical fibre 50 nm close to a sample at vacuum and cryogenic conditions. The main problem is that my UHV chamber is very small ...
LionCereals's user avatar
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2 answers
37 views

Which one to choose as the uncertainty?

Consider ten measurements of a value in an experiment. I know that I should take the mean to estimate the "true" value. But I am confused on how to determine the uncertainty, do I use ...
Geron Naren's user avatar
-4 votes
1 answer
51 views

What is the average time taken to carry out an average experiment in the lab? [closed]

I wan to know the average time taken to carry out an experiment in the lab.
Lyonnex Codes's user avatar
1 vote
2 answers
47 views

What is the upper limit of size for diffracting an object?

All items in the universe can be said to have a De Broglie wavelength which is significant if that wavelength is comparable to the object's size (I don't have to worry about my wavelength diffracting ...
EngineeringMind's user avatar
1 vote
1 answer
51 views

Why fiber optic Sagnac interferometers don't produce multiple interference fringes

I have seen a few Sagnac fiber optic interferometers however, those that I've seen don't produce multiple fringes but rather just one luminant dot with varying intensity. Even if a beam expander is ...
Jimski's user avatar
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2 votes
1 answer
101 views

Ball trajectory in the game of pétanque - unexpected drag results

Context A classmate and I (about college level, not physics majors)need to evaluate the different physical factors at play during a game of pétanque. We thought about estimating the importance of air ...
François Mortier's user avatar
2 votes
2 answers
665 views

Breaking the rock using eggs

Is it possible? Can I break a rock with eggs if I get great speed of egg almost like a Jet and using millions eggs. there is no air resistance and we can accelerate the egg slowly to be like a Jet ...
Creative Mania's user avatar
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Decay constant Question in A level AQA physics

Mark scheme I don't understand 2.7. I have attatched the relevant part of the question and markscheme and also the links to full versions below. Apparantely you use the decay constant in 2.5 to find ...
ayron 13's user avatar
1 vote
0 answers
30 views

How much gas is needed to produce absorption lines?

I am trying to know whether it would be possible to do an undergraduate laboratory experiment to measure absorption lines produced by a gas. The idea is to have a background source of light with a ...
anonymous's user avatar
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1 vote
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What is the meaning of a fiber cutoff wavelength when given as a range?

Many polarization maintaining fibers (for example Corning PM 1550) have a cutoff wavelength specified as a range (for example 1300-1440nm). What is the meaning of this range from the physics point of ...
Jimski's user avatar
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Stopping Potential for the same wavelength is decreasing as I lower the intensity during my Planck’s constant calculation experiment

When I conducted the experiment of finding out the Planck’s constant using a photoelectric cell, I tried to verify that the intensity of light doesn’t affect the stopping potential. Doing this I ...
PRANAV S REWANWAR's user avatar
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0 answers
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Lee's Method for measuring conductivity of a poor conductor

I have taken a lab course this semester and one of the experiments is the Lee's disc method to determine the conductivity of a poor conductor. For anyone unfamiliar with the experiment, this is the ...
Preetham Karki's user avatar
1 vote
1 answer
85 views

Tests for general relativity

As a theorist, I’d guess that in Newtonian gravity we can check for proportionality to mass, and inverse square proportionality to distance, by measuring the ratios of gravitational forces. Is there ...
Sachin Vaidya's user avatar
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Hysteresis curves of a ferromagnet magnetized below saturation

I am confused about the qualitative behavior of ferromagnetic materials. Referencing the diagram below, I understand that magnetizing a ferromagnet from point A to point C (its saturation ...
JasonC's user avatar
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6 votes
1 answer
241 views

Are Weinberg's soft theorems relevant when making predictions about collider physics?

In a seminal paper, Weinberg has shown that one can relate a $n \to m$ scattering amplitude to the $n \to m + k$ scattering amplitude that involves the same particle content plus $k$ additional ...
Níckolas Alves's user avatar
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0 answers
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Temperature too high in kinetic gas theory experiment with steel balls

I'm doing a small experiment about kinetic gas theory where I have to check if the density of my gas corresponds to the barometric formula. My experimental setup is like this one Experimental setup ...
Guillermo Fuentes Morales's user avatar
1 vote
1 answer
38 views

What is the relation between image resolution and Cutoff from 2D FFT functions in frequency space?

This might be dumb, but unfortunately I need some urgent help about Cutoff from 2D FFT functions in frequency space. I am writing my bachelor thesis, near DDL and cannot get a lot of help offline in ...
Anothernewbie's user avatar
1 vote
1 answer
48 views

How to measure actual conductive & convective losses inside an enclosed container?

I've been studying convection and come across empirically-derived formulas for calculating the Nusselt number for various geometries. For my particular use case, I'd like to measure the actual ...
Cloudyman's user avatar
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0 votes
1 answer
40 views

Can we prevent the Higgs field interaction with particles? [closed]

if not why? is it possible in future? Because if it is possible there may be chance of more advance invention
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