Questions tagged [experimental-physics]

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

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22 views

Why on a g2 measurement plot, we have multiple peaks for diferent values of T (delay)?

Why on a g2 measurement plot, we have multiple peaks for diferent values of T? I understand from "Hanbury Brown-Twiss intensity correlation experiment " that the value at T=0 tells us if we have ...
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15 views

Calculating the uncertainty of the average of some measurements

I know questions like this have been asked before, but I'm always confused because there seem to be different ways calculating the uncertainty of an average of some measurements. The first method I ...
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21 views

How do you experimentally determine the value of the Compton edge from data?

A NaI scintillation detector was used to acquire the following data. In order to calibrate the detector, I fitted a Gaussian function to the photopeak. I now want to check that my measured value for ...
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1answer
34 views

Understanding the effect of Compton scattering in Gamma ray spectroscopy

The following calibrated gamma ray spectrum was taken using data for a Cs-137 source acquired using an NaI scintillation detector. The predicted value of the Compton edge was calculated using the ...
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1answer
33 views

Where does the negative electrode come from in an HB11 fusion reactor?

I'm an electrical engineer. Throughout my education, I was taught that current always has a return path. This understanding applies to everything. Batteries use an electrolyte to strip electrons ...
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1answer
38 views

Moment of inertia of a Cardan/Hooke joint?

I'm working on a model that approximates a rotating body as a double Cardan joint: one of these guys. In my scenario, torque is applied to the center shaft and both end shafts are free. The angle ...
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30 views

How does one get ticks of a clock from an atomic clock's microwave signal?

I understand that in an atomic clock there is a microwave signal that is locked to the frequency of the atomic rotation. However, if one wants to extract time ticks from the microwave signal: $v(t) =...
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2answers
36 views

Do things on top of magnets make the magnet heavier

Say you have a magnet set to repel a platform (a really strong magnet) and then load that platform with 1000 pounds worth of stuff does that then get transferred over to the physical magnet
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63 views

Ball motion in water

I am analyzing a video of a ball falling in water with tracker. The ball falls in a free fall for few seconds before it reaches a glass of water. The ball goes down till 3/4 of the glass, then stops ...
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1answer
42 views

Why did the RHIC luminosity decrease after 2010?

This physics today article about particle accelerator operation contains this figure, showing the evolution of peak luminosity over time for major proton-proton and proton-antiproton colliders. ...
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2answers
62 views

Experiments of quantum harmonic oscillator

I am new to quantum mechanics and this is probably a dumb question. What experiments can we do to produce a quantum harmonic oscillator? For example, for a classical harmonic oscillator, we can attach ...
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40 views

Uncertainty in laser beam width

I have voltage vs position data for the cross-sectional profile of a laser beam, acquired from a photodiode, and I'm trying to find the beam's width and the uncertainty in the width. I was planning to ...
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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 ...
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1answer
78 views

What would we have to find to prove supersymmetry correct? [closed]

What would we have to find to prove that supersymmetry is true?
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176 views

How does the source of silver atoms works in Stern-Gerlach experiment?

The Stern-Gerlach experiment used a source of silver atoms. Can you explain what moved the silver atoms from the oven to the screen where their impact was visualised? I am not asking for the deviation ...
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1answer
47 views

Significant Figures in functions

How to extend the idea of significant figures to operations like $\sin\theta$, $\log x$, $\sqrt{x}$, $\cos^{-1} x$, $e^x$ etc. Is there a general rule or method to find/define the no. of significant ...
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1answer
503 views

Aluminium shielding on a cobalt-60 source increases impulse rate

I am performing an experiment to measure the half-value thickness of different materials, and the radioactive source is $^{60}\text{Co}$. To the extent of my knowledge, cobalt-60 is a $\beta$- and $\...
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2answers
203 views

Vertical circular motion experiment - feasible? [closed]

I am thinking of comparing horizontal to vertical circular motion. I think I want to compare (both experimentally and mathematically) the constant tension of horizontal to the varying tension of the ...
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4answers
178 views

What is *physical meaning*? [closed]

What do we mean when we talk about physical meaning of a quantity, an equation, theory, etc.? Should the physical meaning touch on the relation between the math and the real world? Or does it have ...
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0answers
21 views

Force by dielectric [closed]

Consider the following thought experiment: Suppose we have a setup with a dielectric medium of dielectric constant $\kappa$ on a horizontal floor extending from $-\infty$ to $+\infty$. And we have a ...
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1answer
35 views

Optimizing Muon Lifetime Data

I performed an experiment which measured the lifetime of a muon. The apparatus was very archaic and susceptible to disturbances, which means that there would inevitably be some unreasonable data ...
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32 views

What is high-energy optical conductivity?

Can anyone explain to me that what the technique of high energy optical conductivity is? I’m Year 1 Physics major.
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1answer
82 views

Experiment for jammers

I'm going to grade 11 and I have to write an essay in physics. One requirement is to do an experiment which - in the best case - also includes measurements. I would like to write about jammers, which ...
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44 views

Presenting Numbers in Particle Physics

We got some data from the OPAL-detector at CERN and were supposed to analyze the decay of the $Z^0$-particle. In order to do so, we had to write a Python-scriptum. Now, in Python, we obtained the ...
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2answers
50 views

Please show an experiment showing the validity of superposition principle of charges?

I have read in several websites that the superposition principle of electric force has been checked empirically. Can anyone refer/show an experiment (having easy/difficult configurations of charges) ...
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1answer
85 views

How to produce light of a certain wavelength?

Is there a device which takes as input the wavelength or frequency value and produces electromagnetic waves of the given wavelength or frequency using an emitter? It might be that the wavelength range ...
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27 views

electrical susceptibility and magnetic susceptibility

Is there a difference between electrical susceptibility and magnetic susceptibility or they are the same thing? if they are different what are the basic definitions for these terms (no mathematics ...
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110 views

How to operationally realize the following type of equations of motion?

It is well known that for a free particle, described by $H=\hat{p}^2/2m$, $\hat{p}_{x}(t)=$ constant (similarly for other components of momentum). Meanwhile, $\hat{x}(t)$ is not a constant, being ...
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1answer
65 views

What is the importance of the speed of sound in our day-to-day life? [closed]

The speed of sound is mentioned everywhere but, despite studying so much, I still don't understand the importance of the figure and how it has had its impacts on the real world.
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21 views

Experimental confirmation of the principle of virtual work

Are there experiments which directly confirm the principle of virtual work in theoretical mechanics? Other than calculating e.g. the dynamics of a pendulum using this principle and then experimentally ...
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1answer
32 views

How many kWh this turbine would generate? [closed]

My grandfather and I are running some experiments down the river, however we don't have expertise in physics so I bring up this question to the community and hope someone could help. How many kWh a ...
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1answer
52 views

Measuring absolute distance and velocity using self-mixing laser signal beat frequency

In function $D=\frac{c}{4\left|\dot{v}_{s}\right|}\left[\frac{\sigma_{2}\left(N_{2}-1\right)}{\Delta t_{2}}-\frac{\sigma_{1}\left(N_{1}-1\right)}{\Delta t_{1}}\right]$ from formula 8 on p.6686 $v_{s}$...
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30 views

Why does the “expected” line varies with the unknown new physics parameter on Brazil-band plots?

There are two similar questions here, but they could not help me (I could not relate their answers to my problem, at least). I hope that I can make myself clear in the following. Take, for instance, ...
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42 views

Ovalization of a pvc pipe under a weight

I'm not sure if this is the right place to ask this question, but it came up in one of my physics courses so here goes. I want to measure a weight using a Fiber Bragg Grating optic cable. Someone ...
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Is it feasible to simulate CMB scattering surface in a lab?

The CMB last scattering occurred at ~3000K, z=1100. Is it possible to simulate these conditions under lab conditions to help verify the CMB last scattering hypothesis ?
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33 views

Why is the gravitational force that is measured not doubled in the Cavendish experiment?

Each of the smaller spheres is attracted by one bigger sphere. The rotation would work even if just one of the smaller spheres were attracted by a bigger sphere. What is the difference between these ...
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1answer
45 views

Coulomb torsion balance : force or torque

The following links talk about the torsion balance equation of Coulomb. $$F_{\tau} = w \dfrac{\alpha\ D^4}{l}$$ Due to a wide variety of names for the $LHS$ of equation, I am totally confused ...
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4answers
101 views

How do we know that experimental evidence of special relativity can't be attributed to other, unrelated effects? [closed]

While there are many experimental results that seem to align with the predictions of special relativity--some examples being muons from the upper atmosphere reaching the Earth's surface despite their ...
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60 views

Double slit experiment on electrons

Consider a constant flux of electrons through the double slit but let the upper part of the slit be free of any material for a secondary flux of a less frequent electrons passing above the slit.As the ...
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22 views

What should I look for when purchasing a Laser diode with good coherence?

I want to purchase laser diodes that will work well for interferometry. I have been using inexpensive laser diode modules that I buy from of Amazon for 2 or 3 dollars each. For the most part they ...
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3answers
77 views

Is spring constant really a constant value? ( Assume the spring is not changed )

l just encountered a problem that is about a string in harmonic motion. The question states that the cord is elastic and gives a table like this The question didn't states that the cord changes, only ...
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31 views

Materials to shield light in NUV-MIR range with high permeability to alpha, beta and gamma radiations

I'm looking for an effective way to shield light in the class range from NUV (Near ultraviolet) to MIR (Mid infrared) especially in $430 \text {nm}$ to $1100 \text {nm}$ wavelength range, but letting ...
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3answers
98 views

Why does warm water and cold water make different sounds?

Why is there a different sound when pouring water for it being warm or cold? Pouring cold water makes a higher pitch sound than warm water. The difference is clearly distinguishable. I was unable to ...
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1answer
71 views

How should I treat background radiation in an experiment?

I am performing an experiment to verify the inverse-square law for the intensity of a beam of $\gamma$ rays emitted by a sample of $^{60}\text{Co}$. The set-up is as follows: A Geiger-Müller tube ...
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1answer
87 views

What is the effect of magnetic fields applied to an entangled pair of particles?

Just curious...if we can create a pair of entangled particles and position one of them in a strong magnetic field would it have as a consequence that we can't change the spin of the other because that ...
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1answer
92 views

Does anyone know what this equipment is?

Im a teacher and found this equipment clearing out my science storage room. Any idea what it is used for? Thanks!
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Stable Rotation Setup for Experiments (table version)

I am looking for a rotation devise like that one in this video below (from 00:40 seconds). Does anyone know where to get one, or have any idea about how to create a nice and stable rotation setup for ...
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1answer
20 views

Way to reduce lateral movement of a rod when trying to calculate the mass moment of inertia using bifilar pendulum?

Basically I'm trying to measure the moment of inertia of a hollow rod using bifilar pendulum. I will rotate the rod, and measure the period, and use the written formula to calculate the moment of ...
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19 views

What is the literature value for ${\rm CuSO}_4$ electrolyte concentration required for Zinc - Copper electroplating?

I am currently working on a lab report where I am exploring factors that affect the rate of electroplating - currently looking at electrolyte concentration. I am electroplating copper with zinc. ...
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1answer
31 views

Backscattering of gamma rays due to lead

I am conducting an investigation of backscattering in gamma ray spectroscopy. A backscattering factor $F_b$ is defined as: $$ F_b = \frac{N_b}{N_i}\times 100\% $$ where $N_b =$ Number of photons ...

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