Questions tagged [experimental-physics]

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

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Error Calculation

For example a = b +/-c, c is the uncertainity of the measurement d = e +/-f, f is the uncertainity of that measurement A = a/d Then how can I calculate the error of A ?
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Quantum Entanglement Test [closed]

An excited physic student runs into his professor’s office and says, “Hurry, come look. I have just entangled two beams of laser light.” The professor stops what she is doing and goes to the lab to ...
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What is the remaining values of $\tan{\beta}$ of MSSM, not excluded by experimental searches?

What is the remaining values of $\tan{\beta}$ of MSSM, not excluded by experimental searches ?
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Accurate Gravitational Constant and mass of earth [closed]

The question is: How do you calculate the gravitational constant and the mass of earth accurately? Explanation: Cavendish's experiment calculated the mass of earth relative to a reference mass. If ...
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3answers
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Where in experiment do you encounter Lorentizan wavefunction?

Is there an experimental system, or such that can be observed in nature where a particle's wave function assumes a form - $\psi(x)\propto \frac{1}{\sqrt{x^2+1}}$ such that $|\psi(x)|^2$ is Lorentzian? ...
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Lightspeed - what do we measure? Wave group, phase, front and signal velocities

I'm studying for an experiment of measuring the lightspeed c. It will be measured following the rotating mirrors method by Fizeau-Foucault, using a HeNe laser. I could understand - and visualize - ...
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Net Force and Motion with an Atwood machine. Formulate a hypothesis about the relationship between the net force on an object and its motion [closed]

Testing Experiment: Net Force and Motion with an Atwood machine Hypothesis: Formulate a hypothesis about the relationship between the net force on an object and its motion. Think about how this ...
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What physics experiments can I do at home? [closed]

during this pandemic I had couple of physics experiment to do for my homework. They included beer foam decay, ball inertia experiment and so on. Now I have a final homework where I alone need to come ...
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Statistical tension between two measurements [duplicate]

If we have two measurements of the same quantity, say, $m_1=a\pm c$ and $m_2=b\pm d$, how many sigma away are these values? In other words, when we say that two measurements are in e.g. $3$ sigma ...
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1answer
25 views

What was Faraday's experiment's of induction?

I'm searching about the experiments, which Faraday has done in order to discover the electromagnetic induction phenomenon. I didn't find what I need on google scholar nor google books. Can you ...
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Natural and man-made nuclear transitions [duplicate]

I am currently studying nuclear physics, but in this concept, I could not find any related topic for this on the internet. Can someone suggest any references?
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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 ...
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1answer
49 views

Is this $CL$ or $CL_S$ method?

I have already posted this problem here, closed for asking too many questions. I will reproduce the introduction and contextualization here, and try to ask a more specific one that I hope will be ...
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Physical Intuition of Inelastic Mean Free Path

The inelastic mean free path (IMFP) is a quasi-universal curve which describes how far a beam of electrons will travel through a material before scattering inelastically. I have been searching for ...
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1answer
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What is the charge stored by the capacitor?

I learnt that for an uncharged capacitor of capacitance $C$ connected with battery voltage $V$, the energy stored by capacitor is equal to $\frac{1}{2}CV^2$. But in this example for the capacitor ...
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1answer
30 views

Electromagnetic Induction experiment with solenoid

The experiment is as follows A solenoid is connected to a galvanometer and a magnetised iron rod is passed through it. (the apparatus is not ideal, and there is no zero error in the galvanometer) I ...
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1answer
50 views

How do you measure the parity of a particle?

When one looks up elementary particles on Wikipedia, as one of their properties their parity is stated. For example the Proton has parity $+1$, while a Pion has parity $-1$. I understand that you have ...
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1answer
28 views

How is the counting-rate of particles obtained in an experiment?

When reading Light Sterile Neutrinos: A White Paper I came around the following statement: "A further difficulty in interpreting experimental evidence in support of a light sterile neutrino is that ...
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1answer
94 views

A game of boxes with rotating gears

Setup: Suppose you have 3 (identical looking) boxes named A,B,C [furthermore they have identical mass]. You are told the following about the boxes: One of the boxes actually is a uniform mass. We ...
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Air track acceleration experiment

What can be a major error when we are calculating the acceleration of a matter, using the air track? As shown in the picture, the goal is to measure the acceleration of the matter(M). I will hang the ...
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1answer
29 views

Are there any experiments going related to gravitational shielding? [duplicate]

Is it possible somehow to achieve gravitational shielding? Are there any experiments presently going on or future projects?
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4answers
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I need help devising a classroom experiment to detect the magnetic field generated by a current in a wire

I want to devise a simple procedure that can be followed by students to discover that a current in a wire produces a magnetic field near that wire. I am of course restricted to very simple materials, ...
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17 views

Paper with sequential Stern-Gerlach experiments

Often sequential Stern-Gerlach experiments are taken to motivate basic quantum mechanics. But I can't find a paper where these are actually carried out experimentally. I have two questions: Who was ...
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2answers
64 views

Interpretation of the output of a spectrometer: wavelength to energy conversion

First question This question may be uber-trivial, but I have a spectrometer that provides as output the number of ADC counts at given wavelengths (the wavelength vector is not equally spaced), i.e., ...
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1answer
32 views

Creating a temporary magnet using a simple method

Was just wondering if someone could clarify this situation: When I take a Allen wrench and let it come in contact with an iron nail nothing happens. Not really surprising. None of the objects are ...
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Crossover filter gives weird results

I was analyzing results of an experiment on a crossover filter and I was trying to take into consideration the parasitic resistance of the inductor L (called $R_L$). I know the theoretical crossover ...
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Viability of doing an experiment on effect of temperature on superconductor-based maglev?

I'm a high school student who's been tasked with doing a research project, and I've opted to do mine in Physics. I've chosen the topic on superconductivity and I want to investigate the effect of ...
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2answers
91 views

How do we observe that $\frac{dN}{dt} \propto N$?

I was learning how do derive the radioactive decay formula which starts with the experimental observation that the rate of decay is directly proportional to the amount of isotope present. i.e. $\frac{...
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1answer
26 views

Is ambient temperature a continuous function [closed]

Following the standard topology examples of Borsuk–Ulam theorem, did someone checked experimentally that ...
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1answer
47 views

Effect of stacking diffraction gratings

I have a basic question about the effect of transmitting a laser beam through multiple diffraction gratings. Suppose a diffraction grating was used to produce many spots as follows: Would adding a ...
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30 views

Why did the specific charge of an electron show that the electron is smaller than an atom?

Why is the JJ Thomson experiment for specific charge seen as such strong evidence for the electron being smaller than the hydrogen ion? He showed that the specific charge of an electron was over 1000x ...
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How to keep a air bubble bottom of a water glass?

Suppose we have a glass of water. if we make a air bubble bottom of the glass using a straw that will quickly come to the surface because of the pressure ,density difference and the gravity . Assume ...
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1answer
11 views

When given magnification alone,for an upright, virtual image, with convex lens, how can I find object distance [closed]

Formula involved in such calculations, similar examples, link associated with d question
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2answers
68 views

How do we know the direction of magnetic field that we assign to it?

In my class, I was taught about Biot Savart Law and how to calculate direction of magnetic field as a cross product of radial vector from current element and the length vector of current element. ...
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1answer
56 views

Is there some quantitative measurement or concept that can distinguish between a photon and a gluon?

Considering both photons and gluons have a mass of 0, a charge of 0, and a spin of 1, what distinguishes them? I want to exclude answers such as 'they influence different forces (i.e. photons are ...
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1answer
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Electron irradiation of an entire isotope mass [closed]

I'm going to post this question in a "goal" and "question" format so it is easier to follow along: The Goal I'm planning on running a nuclear physics experiment in which I have an arbitrary mass of ...
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1answer
22 views

Detection of charged particle in optical fiber cable

There is a charged particle source and a light source attached to optical fiber cable which is attached to a light detector. Is it possible to detect the passage of a charge particle through the ...
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1answer
46 views

Extracting yields of decays from fits

I'm currently reading various papers on the violation of Lepton Flavour Universality in rare B-decays and I would appreciate some help in understanding the methodology for measuring the ratios in ...
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Are there any real life applications of Quantum Field Theory (QFT) [duplicate]

When searching for QFT's applications, most articles and answers tend to mention how it is used to expand our understanding of physics, e.g. with the LHC. So I'm wondering if you know of any ...
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Mass is affecting final velocity down ramp

I have been doing an experiment where 2 different skateboard frames (like a grind) slide down a metal ramp (1.5m) and the final velocity is calculated by video analysis. I would compare this to the ...
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1answer
24 views

What is the $^{28}{\rm Si(}d,p)$ nuclear reaction?

I am reading about several processes in nuclear physics that put letters in parentheses next to the names of the isotopes. Usually two letters, separated by a comma. Besides $d$ and $p$, I have ...
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1answer
28 views

Relationship of Flux with Energy

Electric Flux seems an arbitrarily defined construct that has no solid anchoring in fundamental physical quantities, and which is only hanging around for historical reasons. What is it measuring ...
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2answers
61 views

Gravity force inside the Earth

It is a well known exercise on classical Newton's gravity that assuming that the Earth has an ideal round shape to compute its gravity force at the given distance from its center. (Answer: it is equal ...
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1answer
25 views

Position of contact areas and coefficient of friction

I am a first year engineering student and I have conducted an experiment with other students. I know that the contact area of an object to a surface does not affect the coefficient of friction given ...
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1answer
32 views

Gravitational light bending and refraction? [duplicate]

I've trying to read up on the evidential merit of general relativity and am rather curious as well as skeptical of early as well of possibly later more rigorous measurements of light (electromagnetic ...
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11 views

Particle mobilities in weakly ionized dusty plasma

I'm searching for experimental data regarding the mobility of electrons and ions in an weakly ionized dusty hydrogen gas. I quickly realized that this is not measured directly and found an equation ...
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3answers
77 views

Measurement of Surface Tension of a Liquid by Capillary Rise Method [closed]

The surface tension at the point of contact for water is inwards (as written in my book) so that would mean it vertical component is downwards but why is that vertical component considered upwards? I ...
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1answer
19 views

Rutherford, Geiger - Marsden experiment

In this experiment alpha particles were used to hit a very thin golden foil. My question is if the foil were not made exactly of just one layer of atoms could it be that in case the multiple layers ...
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1answer
75 views

How can it be demonstrated that locally $SU(3) \times SU(2) \times U(1)$ is the effective field theory till $10^{-15} m $? [closed]

How can it be demonstrated that locally $SU(3) \times SU(2) \times U(1)$ is the effective field theory till $10^{-15} m $?

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