Questions tagged [experimental-physics]
For questions about design, process, data, or analysis of experiments and observations.
3,657
questions
2
votes
0
answers
37
views
Observed frequencies of a drum versus mathematically predicted frequencies
I built a small circular drum in order to compare the actual resonant frequencies versus the resonant frequencies predicted by modeling it as a circular membrane obeying the wave equation with fixed ...
- 31
5
votes
1
answer
2k
views
Do a floor tile or dry sand conduct electricity?
If you touch an electric wire while standing on a ground made of soil or floor tile, you will get electrocuted. So, electricity passes through it. Right? Shall I conduct an experiment by passing ...
CommunityBot
- 1
2
votes
1
answer
53
views
Why is sequential Stern-Gerlach experiment a complete surprise?
In page 5 of his Modern QM , Sakurai block $S_z-$ from first S-G experiment and sends $S_z+$ atoms to next S-G experimen in $x$-direction. Then sends the result of second experiment to third S-G ...
- 8,319
1
vote
0
answers
24
views
Why does the result of Stern-Gerlach experiment SEMI-discrete?
The pattern of Stern-Gerlach experiment on detector is not a continuous one but has two disjoint parts. But each of this two parts isn't such narrow that could be considered as a single values: $\frac{...
- 1,209
-1
votes
0
answers
31
views
Can you detect the existence of virtual particles? [duplicate]
When you collide to particles in a particle accelerator, you get as a result other particles that aren't seen usually because of their short lifetime. This particles will the decay in a series of ...
- 188k
0
votes
0
answers
13
views
What are Semi-Visible Jets?
I'm working on a project that aims to discriminate semi-visible jets (SVJs) in a QCD background, through learning from simulated data in the context of the LHC. I know that these are related to hidden ...
- 101
0
votes
0
answers
89
views
Is there any empirical evidence for the existence of the graviton?
In the standard model of particle physics, there are four fundamental forces/interactions, each governed or conveyed by its respective fundamental particle:
Strong force: quark/gluons
Weak force: ...
- 101
1
vote
3
answers
119
views
After a particle hits a screen and becomes stuck to it, will we know both position and momentum?
After a quantum particle hits a detector screen, we learn two things:
Its position in all 3 dimensions (it's in the bright spot in the screen)
Its momentum in all 3 dimensions (it's stuck in the ...
- 32.8k
0
votes
1
answer
221
views
Collimating a UV LED
I have a task of narrowing a UV LED (375 to 400nm) of diameter 5mm to 1mm on the surface of an object. The LED has a peak output power of 2.2mw (quite low). It has an half Intensity angle of 10 ...
CommunityBot
- 1
15
votes
3
answers
8k
views
What is the *DETECTOR* in the double slit experiment and how does it work?
Is the detector a passive device or is it just a fictional mathematical probe?
I think the detector is somehow consuming the energy responsible for the wave nature of the photons, electrons or atoms, ...
- 159
0
votes
2
answers
77
views
What earthbound experiments show gravitation is general to all matter, and not just towards the earth?
I was debating a flat earther and predictably it turned into a debate on gravitation. He said as far as we know, things fall down to the earth, not because its towards the greatest mass. The ...
rob♦
- 82.3k
1
vote
4
answers
2k
views
On the relationship between slit width and light diffraction
In a light diffraction experiment, using a laser and a diffraction grid we can observe that the slits produce a diffraction pattern when the light from the laser goes through it. I have the hypothesis ...
CommunityBot
- 1
3
votes
2
answers
148
views
Cloud Chamber Failure
Me and my friend are trying to build a working cloud chamber to find muons.
We’ve built the chamber more than six times, and only the first one worked.
In our latest cloud chamber we used a big ...
- 366
7
votes
3
answers
2k
views
The physics behind a homemade particle accelerator
I have made a particle accelerator, like the one in the following image.
homemade particle accelerator
When a metallic pellet passes through the coil, it lights up and generates a magnetic field ...
- 159
1
vote
1
answer
630
views
Derive Charles's Law from ideal gas equation
For a thermodynamics experiment I had to determine the ratio of the volumes of two tanks. The process used was isothermal. I pressurized up one tank and slowly opened the valve between the two tanks ...
CommunityBot
- 1
0
votes
1
answer
36
views
How to check laser beam polarization
Just like in my question. How to check laser beam polarization? What's the easiest experiment to do that will help me understend what type of polarization is present in my laser beam?
- 41
0
votes
1
answer
41
views
Efficiency of particle accelerators
Say the SLAC linear accelerator, to perform inelastic scattering, wants to fire an electron accelerated to 0.99c the speed of light at targets of atomic nuclei.
After the collision, the resulting ...
- 83.9k
1
vote
0
answers
28
views
Forces On Toroidal Wind Tunnel wihen Wing is attached inside? [closed]
Consider the attached Toroidal wind Tunnel.
The Wind tunnel is in Vacuum and the moving air and the attached wing are only inside the toroidal tunnel.
Will the mounted wing on the walls of the tunnel ...
- 11
5
votes
1
answer
768
views
What is the control group in neutrino detection?
Assuming we can't block neutrinos, and most of them pass through the earth, how do we know that the change in the neutrino detector is not just happened randomly? Is the detection of neutrinos more ...
- 109
2
votes
1
answer
45
views
Using Peltier module for heat diffusion experiement [closed]
I'm trying to use a Peltier module (e.g. TEC1-12703) for heat diffusion physical experiment. An external power source provides around 8V with 1A current, so the generated heat from the surface of the ...
- 23
6
votes
2
answers
565
views
Accuracy of various optical instruments
I understand that this may not be the type of question allowed here, but I'm not sure. Feel free to close this if you feel that it shouldn't be here
I'm planning on carrying out a certain set of ...
1
vote
1
answer
34
views
Deep inelastic scattering remains
So I know that the process of deep inelastic scattering results in a collision of an electrons and protons in very high energies. However, I'm guessing that after the parton hadronizes, where would ...
- 83.9k
2
votes
3
answers
751
views
Why is the RMS value taken to calculate uncertainty in random errors
My Text Book mentions the use of RMS (Root Mean Square) to calculate the value of uncertainty.
"Random errors are handled using statistical analysis. Assume that a large number ($N$) of ...
- 23.5k
5
votes
1
answer
156
views
Current through a solenoid: magnetic field gives a staircase graph
We were running current through a solenoid coil with an iron core, and measuring the resultant magnetic field strength. We expected a purely linear relation for the "current-field strength" ...
- 11
0
votes
0
answers
17
views
How/Where to find the theoretically expected cross-correlation between CMB and Large-Scale Structure in real sapce?
I have cross correlated the CMB map (WMAP 7 Year map) and the large-scale structure tracer- quasar (NBC-KDE Quasar catalog from SDSS-6 avilable here) in real space by following the this paper by ...
3
votes
1
answer
176
views
Wiki video shows that vacuum fluctuations exist, despite that vacuum fluctuations do not exist
I have been reading this article about the quantum vacuum state, and in the section that I linked to, there is a video showing an experiment that shows visibly that quantum fluctuations are actually ...
- 28.2k
0
votes
1
answer
37
views
Understanding the Magneto-optical trap
I am reading about this apparatus at Wikipedia: https://en.wikipedia.org/wiki/Magneto-optical_trap
And there is the following sentence which I don't understand:
"As atoms travel away from the ...
- 91
8
votes
1
answer
305
views
Does this method of predicting the ratio of translational diffusion coefficients for a sphere and a sheet, work?
Imagine that I have a spherical particle of molecular weight $M$, volume $V$, and some experimentally observed center-of-mobility translational diffusion coefficient $D_{sphere}$ in water. I take ...
CommunityBot
- 1
1
vote
4
answers
3k
views
Relationship between concentration and resistance of aqueous solutions
I'm a senior physics/chemistry student working on a practical assignment where I am trying to identify the resistance of CuSO4 in solution (distilled water). I have recorded my data and determined it ...
CommunityBot
- 1
6
votes
2
answers
334
views
Experimental evidence of linearity of states
One of the fundamental postulates of Quantum Mechanics is that states of a system are linear combinations of ground/observable states. Could someone point out some of the experiments leading to such a ...
- 195
4
votes
1
answer
684
views
How to maximize Peltier devices' cooling capacity?
I am currently working on a project requiring the use of Peltier devices. I have attached the cool side of the device to a copper plate and the hot side to a heat sink with a fan.
What would be the ...
CommunityBot
- 1
2
votes
1
answer
66
views
What do WMAP CMB Temperature map values represent exactly?
I understand that Cosmic Microwave Background Radiation Map provided by WMAP survey in HEALPix pixelization format is nothing but an array of temperatures associated with the cmb radiation coming from ...
rob♦
- 82.3k
-1
votes
1
answer
104
views
Why did the air not heat up in this experiment demonstrating the atmospheric greenhouse effect?
In the paper "Experimental Verification of the Greenhouse Effect", the authors (Hermann Harde, Michael Schnell (2022)) describe an experimental setup that they say demonstrates the ...
- 24.3k
9
votes
3
answers
3k
views
Active gravitational mass of the electron
In PSE here electrons are added to a sphere and gravitational modifications are expected.
My question is:
Is there any experiment that show that a negatively charged object is source of a stronger ...
- 852
4
votes
0
answers
44
views
Current bounds on the value of $g$ for antimatter
In 2011, the ALPHA experiment showed that the gravitational acceleration for antihydrogen was between -65 and 110 times the normal gravitational acceleration. Has there been any improvement on the ...
- 694
0
votes
1
answer
59
views
Meaning of (collider1)x(collider2) in phenomenology papers
In some phenomenology papers in particle physics, often the cross section is shown as a function of some parameter of the model given a certain centre of mass energy of a specific collider. However, ...
- 4,437
0
votes
3
answers
91
views
Has any terrestrial experiment been carried out which proves whether light can be thrown sideways or not?
Let me stress, TERRESTRIAL EXPERIMENT, as distinct from astronomical observations of the transverse Doppler effect, stellar aberration and so on.
To clarify what I mean by 'thrown sideways'. ...
1
vote
1
answer
177
views
Systematic+Random Uncertainty for velocity measurement
I have a question regarding systematic and random uncertainties. I have to measure the mean value of a velocity measurement in flow field at a point. I've recorded say 1000 samples in time, which I ...
CommunityBot
- 1
1
vote
0
answers
30
views
Ball bounce equation using pressure [closed]
Is there an equation that can calculate how high a rubber ball rebounds after being dropped? I will be using the pressure of the ball as a variable. I will drop the ball from a height of 1.5m with ...
- 4,437
0
votes
1
answer
263
views
Superposition of Microwaves experiment? How does it work?
Please can someone help me out with this experiment and see if this is correct?
So the experiment consists of one metal sheet that fully reflects microwaves (and is fixed in its position), and the ...
CommunityBot
- 1
1
vote
3
answers
374
views
How to determine the concentration and sign of the charge carriers in copper
I need to design a procedure for an experiment to determine the concentration and sign of the charge carriers in copper. I'm given:
A slab of copper 2.0 mm thick, 1.5 cm wide, and 4 cm long
One very ...
CommunityBot
- 1
0
votes
0
answers
22
views
Zeeman effect on a superposition state
I am currently studying Magneto-optical trap(MOT). When a photon absorption takes place, there is a transition of an atom from an initial state to a final state (more accurately an electron in the ...
- 1,208
8
votes
1
answer
187
views
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, ...
CommunityBot
- 1
0
votes
2
answers
51
views
Can the standard errors in the slope and the intercept of a linear regression be used to get the uncertainty in the dependent variable?
I have bought a resistor that works as a heater when a voltage is applied to it, and the seller provided me these $ \left(V (\mathrm{V}), T (\mathrm{°C})\right)$ points: $(6.20$, $200)$, $(7.75$, $250)...
- 8,319
0
votes
2
answers
279
views
Calculating errors from given graphs
In a recent experiment, I have found the viscosity of glycerol by measuring the time it took for steel balls of measured density and radius to fall a certain distance in the liquid.
Now, I need to ...
CommunityBot
- 1
4
votes
3
answers
5k
views
How does a Tesla coil make fluorescent light glow?
I know that the secondary coil used in the Tesla coil radiates electromagnetic waves in the surroundings.
This radiation makes the electrons in the fluorescent material of the light oscillate, and ...
- 3,010
0
votes
1
answer
402
views
Trying to understand electron diffraction
I'm trying to understand how electron diffraction works, but I'm not really getting it. Here's an image
Here are a couple of questions about it that I can't figure out.
Why is the angle of the beam $...
CommunityBot
- 1
1
vote
1
answer
237
views
Understanding how Stern–Gerlach apparatuses work
I'm studying about the Stern–Gerlach experiment. I'm having some hard time to figure out how the Stern–Gerlach apparatuses work. I have the following question:
Transfer a beam of electrons through ...
CommunityBot
- 1
1
vote
1
answer
442
views
How to get numerical solutions for Geodesic path using numerical Metric in General Relativity?
I have question regarding numerical method to calculate geodesic path, when the analytic form of the metric is unknown, please.
Suppose that we have a black-box at hand that can show us a measurement ...
- 1
0
votes
2
answers
49
views
How can I concentrate ions in a very small area?
I am interested in concentrating ions in a very small area, so the ion density of that region is elevated above normal levels.
What is the field of study, or term, that describes what I am talking ...
- 8,510