Questions tagged [experimental-physics]
For questions about design, process, data, or analysis of experiments and observations.
3,204
questions
0
votes
0answers
20 views
How to manage lab data, graphs and reports
I’d like to ask about the way you tackle post-lab work and the software you use, since I’m a new physics student at uni and would like to know how others confront this type of task. This might be an ...
0
votes
0answers
17 views
Scanning electron microscopy (SEM) images without Conductive Samples
The traditional understanding for obtaining scanning electron microscopy (SEM) images is that one first needs to coat the specimen in gold (or similar).
This is supposedly necessary because biological ...
-2
votes
0answers
19 views
Fluid mechanics - Transport Phenomena [closed]
Could someone guide me in this resolution?
As the air that will be used to obtain hospital oxygen needs to be free of particles and water, before going to the heat exchanger to condense it must go ...
4
votes
1answer
58 views
Is there any experiment to check discreteness of space?
This article from 2015 seems to suggest that there will be experiments to check discreteness of space:
If space-time is discrete, there should be imperfections. And even if
rare, these imperfections ...
0
votes
1answer
73 views
Will this method work to take a photo inside a black hole?
Taking a Photo Inside a black Hole
The following is a “thought Experiment” which could describe an actual methodology to photograph (and be able to see the photograph) of the area inside a Black Hole’...
2
votes
0answers
44 views
As of 2021, what is the latest record for lowest temperature?
From what I understand in this article, absolute zero(0 kelvin) is an impossible task.
They state that the lowest temperature achieved in the laboratory was 0.1 nanokelvin.
The lowest temperature ...
-2
votes
0answers
12 views
Using indirect measuring rules determine the absolute error for expression [closed]
Using indirect measuring rules, determine the absolute error for
the expression $$N=(A+B)-4+k^4$$
1
vote
1answer
20 views
Sphericty axis and thrust axis
I read a paper about the detection of the gluon at DESY in the 1979. There are described two methods of evaluating the results.
I do understand that jets are measured and the momentum is pretty ...
0
votes
0answers
19 views
Heat Transfer Kirchhoff's Law [closed]
Pls Explain with the help of Kirchhoff's Law the second paragraph of the image attached here.
A remarkable thing is worth noting here. The total radiation emanating out of a non black body placed in a ...
0
votes
1answer
48 views
Experimental proof for if a d.c. electric current inside a naked wire is being influenced by an external electrostatic field?
For example a d.c. electric current carrying naked wire inserted inside the electrostatic field between the two plates of a vacuum capacitor and with the wire not touching the two plates of the ...
0
votes
1answer
20 views
Determining Characteristics of Spatial Light Modulator (SLM)
im quite lost somehow. I know this is a really basic thing and I know I should be able to do it, but something is going on with me and I tend to have problems with everything these days. Anyway:
I ...
-1
votes
1answer
40 views
Does the muon anomaly demonstrates the need for a larger accelerator? [closed]
Is new science afoot?
”Most physicists believe that a rich trove of new physics waits to be found, if only they could see deeper and further. The additional data from the Fermilab experiment could ...
0
votes
1answer
55 views
Can some one explain the fake factor method in a general sense?
I am trying to learn the fake factor method but I am having trouble understanding the concepts. I know it is a method to check the rate at which hadron jets from proton - proton collision are mistaken ...
2
votes
1answer
78 views
Fermilab's $g\!-\!2$ experiment: physics beyond the Standard Model?
On April 7 of this year the results of the Fermilab's $g\!-\!2$ experiment were published, increasing the discrepancy with what the Standard Model predicts.
The combined results from Fermilab and ...
0
votes
0answers
16 views
How does 3s, 3p energy levels of Si in vicinity of other atoms interact to give four new orbitals?
I was studying about semiconductors in Kasap S.O book - "Principle of electronics". This statement "3s, 3p energy levels of Si in vicinity of other atoms interact to give four new ...
0
votes
0answers
8 views
Dealing with Larmor frequency fluctuations for $\pi/2$ pulses
I am currently facing the following experimental problem:
I can currently measure the $z$-components of a spin assembly after a $\pi/2$ pulse:
The static B field is along the $z$-direction and with a ...
0
votes
1answer
48 views
Why are jets misidentified as leptons?
I understand that jets come from the process of a proton-proton collision and the QCD confinement which create more quark-anti quark pair that emit this jets of particles. These jets of particles what ...
2
votes
2answers
36 views
Simplifying acoustic test procedure — don't want to bother neighbors with party!
I am having a party and would like to keep disturbing neighbors to a minimum, but maximize the volume we can get away with.
I devised a quick n' dirty test plan to generate some frequency response ...
0
votes
1answer
33 views
I am trying to calculate the specific heat of an unknown object through an experiment; why am I getting a negative value? [closed]
I am doing a Physics lab where I have to determine the specific heat of an unknown object (50 g).
The lab is basically composed of two parts:
A calorimeter is filled with 500 mL of water and is ...
1
vote
1answer
18 views
Maximum water temperature rise while shaking partly filled bottle
Imagine an idealized perfect cylindrical closed bottle which is partly filled with water. Say you have a machine which shakes the bottle horizontally for a certain time at a fixed frequency. Obviously ...
-2
votes
1answer
62 views
How can you “construct” a high pressure?
To create high pressure you have to enclose material in another material. Does this mean that the force involved in the pressure you want to create can never be higher than the binding forces which ...
0
votes
0answers
37 views
How to find the integrated luminosity for a 5$\sigma$ discovery?
I was thinking about the procedure needed for the discovery of a new particle. Suppose a data-analysis aims at searching for a new resonance X decaying to two electrons after collecting 20 fb$^{-1}$ ...
0
votes
2answers
161 views
Why do gravitational waves move at the speed of light? [duplicate]
They are not a form of electromagnetic radiation, are they? So, why do gravitational waves move at the speed of light?
0
votes
1answer
128 views
Why are there two vernier scales on a prism spectrometer?
Why are there two vernier scales on a prism spectrometer and why are they 180 degrees apart?
Example image (source):
I have some idea that it reduces the error in measurements but I don't exactly ...
0
votes
0answers
9 views
Height of capillary rise
Are there any tabular data in which you can find the values of the height of the capillary rise depending on the radius of the capillary? The type of liquid or capillary does not matter.
4
votes
3answers
64 views
Should we include instrumental uncertainty when calculating the uncertainty of a measurement?
Imagine we are measuring the period $T$ of a pendulum using a stopwatch
The stopwatch has an inerent instrumental uncertainty (e.g. 0.1s) let's keep this fact in mind
Due to random error (let's ...
0
votes
0answers
46 views
What was the $a_\mu$ value for the Brookhaven muon $g-2$ experiment?
See title. I am researching the muon $g-2$ experiments and have found $a_\mu$ values for CERN (1, 2, and 3) and Fermilab, but not Brookhaven. I would appreciate your help.
0
votes
1answer
34 views
Charging capacitor, Relaxation time - obtained experimentally and theoretically [closed]
In the shown circuit, I was measuring how the voltage on capacitor $V_C$ changes with time. The theory says that $V_C(t) = V_T(1- e^{-t/R_1C})$, where $V_T$ is voltage on battery. If I plot my ...
7
votes
4answers
987 views
Help interpreting “five sigma” standard?
So, I am coming from a math/stats background. I was just wondering about this in the abstract, and tried Googling around, and came across this article which says the following regarding some ...
2
votes
2answers
41 views
The lowest possible frequency of sound wave
What is the lowest possible frequency of sound waves. I imagine that if a plate vibrates slower and slower it stops producing sound and starts to just 'move' the air around. What is this minimum ...
0
votes
1answer
25 views
Drawbacks of dielectric wall accelerators
Wby are dielectric wall accelerators not used as a replacement to conventional particle accelerators? How “efficient” are they in accelerating particles compared to conventional accelerators?
-5
votes
1answer
62 views
What is time? What is its definition? [closed]
What does time really mean? What is its definition according to physics? And also, why is speed, acceleration is measured with respect to time only, we could have also used some other reference point ...
-4
votes
2answers
80 views
Does science really have base for Its expriments? [closed]
For most of the macroscopic observations, everything has a reason, but going into the microscopic level, atoms, then the electrons, then quarks.
Science has proved the existence of quarks by various ...
0
votes
1answer
19 views
Polynomial regression and errors weighted with square root of reduced chi square
I conducted a polynomial regression of the form $y(x) = A+Bx + Bx^2$, and would like to obtain parameters $A$, $B$ and $C$ and their respective errors/confidence level. The reduced chi square is less ...
-1
votes
1answer
44 views
What were the main results of the BaBar Experiment?
I have been trying to find a review of the BaBar experiment results for quite some time now. Can anyone link a few papers which illustrate what has been achieved so far?
1
vote
3answers
74 views
Is there any experiment where QM can predict individual results?
This is my question:
Is there any actual experiment or observation that only needs to be performed once (rather than repeating it a hundred times and analyzing the ensemble), the result of which can ...
0
votes
0answers
27 views
How much centrifugal force would it take to create gravity?
If say your car was stuck in the mud. You press the gas the wheel spins and the centrifugal force shoots mud out the back, how fast would the tire need to go to keep the mud perpetuating around it ...
1
vote
3answers
57 views
How to take the reading of voltmeter if the needle falls between 1.6V and 1.7V?
What value should I take based on this voltmeter reading as shown in the picture? Is it 1.6V or 1.7V? I believe there is a parallax error in this case. Therefore, the reflection on the mirror would be ...
0
votes
0answers
10 views
Are image formed in both the situations?-lightrays from object to mirror then our eyes and when many light rays converge?
We are able to see images of objects(in mirror)
because the light after starting from the object then deflecting from mirror reaches our eyes,right?(if I'm wrong please tell) and it is also said that ...
2
votes
2answers
88 views
How do we know that the muons created by cosmic rays in the upper atmosphere are the same muons reaching our detectors at the surface?
I was reading the summary of most significant experiments done so far verifying muon's Special Relativity time dilation and lifetime extension here:
https://en.wikipedia.org/wiki/...
0
votes
0answers
6 views
Ion current to a planar Langmuir probe
Consider a planar Langmuir probe in a nonthermal collisionless plasma. Let $\Phi_p$ the plasma potential (far away from the probe), $\Phi_w$ the bias voltage on the probe. I am trying to compute the ...
1
vote
3answers
21 views
How to display an measurement results with error bar given huge number of digital measurements? [closed]
I need to measure the flow rate using a flow meter. This flow meter collects 6000 data points over the course of 5 minutes for every temperature of our experiments. I repeat this experiment at ...
0
votes
1answer
51 views
Behavior of a gas as a function of frequency by transforming the Navier-Stokes equations into frequency using the Laplace transform?
How does a gas behave as a function of frequency and not of time by transforming the Navier-Stokes equations in the frequency domain using the Laplace transform?
https://en.wikipedia.org/wiki/...
2
votes
1answer
50 views
Positron discovery
I was reading about Carl David Anderson's discovery of the positron and I have a question.
I understand why it was classified as positive electron (due to its curvature direction and amount of the ...
1
vote
1answer
30 views
How to measure temperature with a barometer?
I know how to use a thermometer to determine the pressure (the Klayperon-Clausius equation) or to conduct an experiment with heating water to a boil, and look at the table of the dependence of the ...
0
votes
1answer
26 views
Finding out the magnetic field at anypoint outside a permanent magnet (Cylinder,Cube)
I am working in a project where I am using different shaped permanent magnets for levitation of diamagnets. I am facing problem while calculating the magnetic field around these permanent magnets. To ...
2
votes
3answers
46 views
What is the probability distribution for the detection times of radioactive emissions from a radioactive sample?
Assume I have a radioactive sample composed of $N$ atoms of some type A. I know that if I measure at time t the number of atoms not already decayed, this number will be given by
$$
N(t) = N_0 \exp^{-t/...
0
votes
0answers
27 views
How are the hypothetical intermediate “dark photons” bosons theorized to couple dark matter with normal matter?
I believe that dark matter is said to couple with normal matter only gravitationally?
Do these relatively new, hypothetical so far, "dark photons" suggest that there can be also an unknown ...
0
votes
0answers
21 views
New Generation Particle Acelerators
Apart from Plasma Wakefield Accelerators, there are recent developments in Dielectric Laser Accelerators such as the one presented in this article:
https://www.popularmechanics.com/science/a12564/...
2
votes
0answers
34 views
Principles and methods of measuring the orbital angular momentum of $\rm H$-atom
When we talk about the orbital angular momentum (OAM) of the $\rm H$-atom, we mean the eigenvalues $l(l+1)\hbar^2$ of the OAM operator of the electron $\hat{L}^2$ defined from its classical ...
