Questions tagged [experimental-physics]
for questions about design, process, data, or analysis of experiments and observations.
0
votes
0answers
21 views
Proposed experimental cosiderations of a micro-mechanical oscilator in a superposition state
This question asks about the experimental result that is theoretically expected or is know already from experience, when one considers the following two scenarios for the micro-mechanical oscillator ...
1
vote
2answers
27 views
Can't see any traces of particles in my Wilson chamber without radioactive material
I am doing an essay about particle physics and I need some help.
I am comparing the results in a Wilsonchamber with and without a radioactive material present. I were able to see a lot of traces from ...
9
votes
3answers
350 views
What are the experiments performed to determine the position of an electron inside an atom to verify the probability wave function data?
What are the experiments performed to determine the position of an electron inside the atom to verify the probability wave function data? Is it possible to do those experiments in real life?
-2
votes
0answers
23 views
Surviving only on another's exhales? [on hold]
While reading this - Surviving under water in air bubble - this question came to me:
How long can an adult person survive on breathing in only exhales of another adult person? Can this be even ...
-1
votes
0answers
16 views
Why do the fish appear to glow blue and orange? [on hold]
I was visiting an aquarium today, and the fish and the rocks had a visable blue glowing outline on every edge pointing in one direction, and an orange glow in the other direction. It was as if a child ...
0
votes
0answers
21 views
How to experimentally measure spin of photon?
Given that we know the spin of photon should be +1 or - 1, is there any experiment to directly measure and confirm it? I looked up stern-gerlach experiment is used on charged particle not photon.
1
vote
0answers
21 views
How is a NMR spectrum obtained?
I am reading about NMR, and from what I'm understanding it should give information on the transition energies in the spectrum of the nuclear spin in a magnetic field.
What I don't understand is how ...
0
votes
0answers
7 views
SLED SLAC voltage and power profile
Anyone who has read the concept or papers related to sled slac, can tellme how to plot the voltage and power profiles?
0
votes
1answer
49 views
How to analyse the LHC signal for Higgs?
With increasing energy the collision decreases in the plot for signal in LHC. why is that? and at an energy 125GeV the no of events suddenly increases. How this proves that higgs has a mass of 125GeV?
0
votes
1answer
22 views
What is a flux conserver and how does it work?
A number of plasma physics papers I've seen mention "flux conservers", e.g. this paper. However, despite my best efforts, I can't find a good description of a flux conserver or how it actually works.
...
0
votes
2answers
19 views
How would a moving charged particle react within a parallel arrangement and conical arrangement of magnetic fields?
I am very interested in finding out how a moving charged particle would react if it were to enter into an area with parallel magnetic fields and also if it were to enter into an area with conical ...
-2
votes
1answer
43 views
Shape of pendulum bob
Why are pendulum bobs spherical, and not any other shape, like cubical?
We were asked to perform an experiment and calculate the approximate value of g using a pendulum, by the formula
T=2pi(l/g)^(1/...
3
votes
2answers
70 views
Torricelli's law doesn't seem to apply in an experiment. Why could this be? What is going on?
For physics class we've done this experiment where we would measure the speed of the water escaping from a water bottle through a hole in a side of it. We would calculate the speed through kinematics ...
0
votes
0answers
37 views
Experimental methodology - what are the units?
I have a problem with finding the units in my experiment. So I have come as far as creating a chart where the y-axis is logn* with the unit 10^27∙m^(-2)∙s^(-1) and the x-axis with logp (10^5∙Pa).
...
0
votes
1answer
47 views
Can the deflection of an electron beam create a Lorentz Force capable of propelling a spacecraft?
Please reference the conceptual drawing below of this spacecraft propulsion idea. In the vacuum of outer space, if a strong electron beam enters a strong magnetic field, as shown in the drawing, it ...
-1
votes
1answer
54 views
Measuring the speed of light
Imagine that you have 2 devices in a room (say 2 identical smartphones) and you video-call one another. Once connected, you arrange them in such a way that the outer (not the selfie) camera of the ...
3
votes
2answers
86 views
Are there experimental observations of the Abraham-Lorentz force?
The Abraham-Lorentz force is the force a classical charged particle particle exerts on itself due to its own electromagnetic field. It has a rather simple formula that reads
$$
\vec{F}_\mathrm{AL} = \...
1
vote
5answers
48 views
Why does a ray parallel to principal axis passes from focus after reflection from a concave mirror and vice a versa is also true? Why is it so?
I read this as basic rules or laws you can say in REFLECTION from concave mirror.
3
votes
1answer
93 views
Is anything expected to be found at CERN with 14 trillion electron volts that wasn't found at 13?
Based on this article
the accelerator has smashed together approximately 16 million billion
protons since 2015, when it reached its current energy of 13 trillion
electron volts. Planned ...
1
vote
1answer
21 views
Majorana Neutrinos in the KamLAND-Zen
I'm reading the following paper concerning the KamLAND-Zen experiment "Search for Majorana Neutrinos near the Inverted Mass Hierarchy Region with KamLAND-Zen"
In the second paragraph of the first ...
2
votes
1answer
47 views
What's the mass of $D_1(2430)^{\pm}$?
What's the mass of $D_1(2430)^{\pm}$? The standard reference http://pdglive.lbl.gov/ParticleGroup.action?init=0&node=MXXX035 only shows the data for $D_1(2430)^0$ but not for $D_1(2430)^{\pm}$. ...
1
vote
1answer
39 views
Experimental measurement of the radial excess
Update: I have updated the the question, see below.
The radial excess due to the curvature of spacetime is a well-known prediction of General Relativity that is often mentioned in introductory texts, ...
0
votes
0answers
13 views
How to reduce measuring angle of JSN SR04T?
I wanted an waterproof ultrasonic sensor. So I used JSN-SR04T (NB: link to PDF document), imaged below. But the problem is it has huge measuring angle, 75%, which results in measuring obstacles which ...
1
vote
1answer
20 views
What laser frequency is needed for the Doppler cooling of iron?
What laser frequency is needed for Doppler cooling iron? How do you determine this frequency?
1
vote
1answer
72 views
Einstein's Elevator thought experiment and relativity
Einstein's elevator thought experiment contains the following premise:
An observer in a box will see free bodies moving identically between when the box is uniformly accelerating in gravitational ...
1
vote
0answers
54 views
Are any two elements indistinguishable using a single measure? [closed]
According to infoplease.com, elements can be investigated using a range of different techniques to determine their fundamental properties. I'm assuming this list isn't exhaustive.
Some properties ...
-2
votes
0answers
45 views
How can a photon have an electric field with charge
https://www.google.com/search?q=photon&oq=photon&aqs=chrome..69i57j0l3j69i60l2.2981j0j9&client=ms-android-tmus-us-revc&sourceid=chrome-mobile&ie=UTF-8
pho·ton
/ˈfōtän/Submit
...
1
vote
0answers
17 views
Unequal area's under a graph of induced voltage (magnet falling through a coil) against time - Faraday's Law
I have done an experiment where a magnet was dropped through a coil of wire and the induced emf was recorded.
My understanding is that the area's under the positive and negative sections of the ...
1
vote
1answer
33 views
What's the number of significant digits for error bars? [duplicate]
What's the number of significant digits for error bars? For example, the Particle Data Group lists the proton mass as,
$$938.2720813 \pm 0.000058$$
Should I take $0.000058$ as having 2 significant ...
1
vote
0answers
22 views
What would happen if a Type 1 superconducting sphere was placed over the north pole of a magnet?
This is a bit of a thought experiment but I thought it was rather interesting. I was doing research on superconductivity of Type 1 materials and how they repel magnetic flux due to the Meissner effect....
0
votes
1answer
29 views
Impact Flash? In Vacuum?
I was wondering, when you have a "hypervelocity impact" e.g. a meteor or Space Debris hitting a body in orbit, why do you get a "flash" of light and how large would the flash be for a given impactor ...
1
vote
2answers
52 views
Removing zero-counts in exponential decay measurement
I'm doing an experiment where I'm measuring the mean-lifetime of muons. I have a set of data points for the number of decays against time, resembling an exponential distribution (of course). But in ...
1
vote
1answer
71 views
Why should $\nu_\mu\to \nu_e$ oscillations be expected to be unobservable in short baseline experiments?
The blog here says
On the other hand, several rogue experiments refuse to conform to the standard 3-flavor picture. The most severe anomaly is the appearance of electron neutrinos in a muon ...
0
votes
1answer
29 views
Looking for something to reflect ultraviolet light at extremely low wavelengths [closed]
I am looking for some sort of mirror that will reflect ultraviolet light at extremely small wavelengths (200-250 nm). The main purpose of it is to amplify the ultraviolet light and cause it to spread. ...
0
votes
1answer
52 views
Estimate of neutrino masses from the values of $\Delta m_{21}^2$ and $\Delta m_{13}^2$ only!
The blog here says that
The measured mass differences between the eigenstates are $\Delta m_{21}^2=7.5\times 10^{-5} {\rm eV}^2$ and $\Delta m_{13}^2=2.5\times 10^{-3} {\rm eV}^2$, suggesting that ...
2
votes
2answers
113 views
Is the strength of the magnetic field the same across the surface of the magnet's pole?
Consider the following configuration:
Will the two blocks of iron (in the image) experience the same magnetic pull (one being in the center and the other closer to the edge of the pole's top surface)?...
0
votes
0answers
10 views
Stellar aberration: distal or local? Experimental proof?
Stokes put forward the theory (I am simplifying here.) that stellar aberration takes place out in space and that light from stars is already fixed in direction with respect to the Earth's surface by ...
1
vote
0answers
15 views
Does bending a piece of steel change the speed of sound in it?
Specifically, I have a student investigating sound produced in a helical spring (slinky) when struck. When it is struck it produces a sound that changes in pitch - from very high to quite low. Also, a ...
0
votes
1answer
59 views
Motion of the center of mass of rigid bodies in space
For the classic two body problem, I know that the motion of the center of mass is a straight line (with respect to an inertial frame), provided that the bodies are considered as point particles.
Now ...
1
vote
1answer
97 views
How can a Lego version of a Kibble balance measure the Planck constant?
As the picture shows below
[][1]
in a Kibble balance, one can drop out the measurement uncertainty of $B$ (magnetic flux intensity) and $L$ (length of coil) by the use of two modes, force mode and ...
-1
votes
0answers
27 views
Compass and magnetic field
How can a compass be used for the determination of the quantitative value direction and magnitude of a magnetic field at a point?
0
votes
0answers
20 views
Finding the Equation for Water-flow Experimentally
I am interested in finding the formula for water flow experimentally.
I used different pipes for this. 3 pairs, each pair has two pipes, same diameter, different lengths. The taller one of pipes in ...
2
votes
0answers
21 views
What can I investigate concerning the stability of bikes? [closed]
I'm in high school, and I'm doing an Extended Essay for IB? I only have 1 bicycle and no fancy tools or measurement equipment, so it has be a pretty simple experiment, but complex enough that I can ...
1
vote
0answers
40 views
Are there any practical implications of string theory? [duplicate]
In my understanding, Strings theory tries to establish a functional model explaining how the world works.
What are some practical applications of string theory?
Would a solution to one of the ...
1
vote
1answer
26 views
Shorthand error notation (with brackets) accros decimal point
I have a small doubt regarding the use of shorthand error notation, i.e. $6.626070150(81)$ instead of $6.626070150 \pm 0.000000081$.
When the error has 2 s.f. (such as when the error is just over $1 \...
2
votes
2answers
88 views
Higher-order dispersion in non-linear optics
In many cases, dispersion of an optical medium is presented by saying that the dependence of the wavenumber $k$ on the (angular) frequency $\omega$ can be expanded in Taylor series as:
$$ k(\omega) = ...
0
votes
2answers
33 views
Shot noise and single photon detection
I am looking into the noise considerations of a single photon detector, specifically an avalanche detector. I am wondering if it makes sense to think about shot noise when considering a single photon.
...
18
votes
1answer
188 views
Are the masses of merging black holes correlated?
LIGO/VIRGO recently released data on observed "gravitational wave transients", mostly BH-BH mergers. The data includes a plot of the primary and secondary mass (the primary mass is defined as the ...
0
votes
2answers
44 views
Explanation of formation of Newton's rings
I was asked to do a lab report in my University about Newton's rings experiment that we made in lab. I understand that the aim of the experiment is to measure the wavelength of a light after the ...
1
vote
1answer
56 views
Stokes' law on non-spherical objects
So I have been thinking about Stokes' law and damped harmonic motions in a fluid. Now Stokes' law is only model on spherical objects and if I model this as a spring mass system and oscillate a ...
