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Questions tagged [experimental-physics]

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

2
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1answer
18 views

White Light Interferometry [on hold]

I have arrived at a way to produce Arago’s spot with a quality white led flashlight. How would I go about writing a small educational paper on this? And, most of what I have seen on the web uses ...
0
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0answers
13 views

Magnetic Field Strength Measurement at Extreme Temperatures

I have just been given a project at work and we are magnetically stress testing DUTs at extreme temperatures going from -40 Degrees Celsius to 200 Degrees Celsius. I need to come up with a way that we ...
-1
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0answers
7 views

Relation between the Number of Optical Fibers in the Bundle and the Power Output of the Light

I am working in project about optical fibers. I need a formula or equation that relates the number of fibers in the bundle with the output power of the transmitted light.
0
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0answers
10 views

Is the Euler-Eytelwein equation also applicable for sliding friction?

Is the Euler-Eytelwein equation also applicable for sliding friction? Does this hold true if you just replace the coefficient of static friction with the one of sliding friction? I'm working on a ...
0
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0answers
25 views

Laser creating weird patterns on screen when reflected from a vibrating membrane

Me and a few friends were doing an experiment today in which we took a membrane stretched over a speaker, and a small mirror in the center of the membrane. We reflected a laser off the mirror on a ...
0
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0answers
27 views

Relationship between work and kinetic energy?

Lab Question: What is the relationship between the work done on a car as it rolls down a ramp and its kinetic energy at the bottom of the ramp? We have a 30 gram car that starts above a table and ...
0
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0answers
9 views

How to calculate the drag force of a cyclist and the drag coefficient?

I have a creative math assignment which my class was tasked to do. Thus I decided to create my work on physics, more specifically aerodynamics. I want to create a function which calculates Drag with ...
0
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0answers
26 views

What is the difference between metallicity and semimetallicity?

I am looking for a definition of semimetallicity from an experimental point of view ( $\rho(T)$, carrier density, mean free path, scattering time, etc.) and from a theoretical point of view. Can ...
0
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0answers
17 views

Alternative to Helium-Neon mixture when building a spark chamber

I have a project for building a spark chamber however have no way of procuring the Helium Neon gas mixture as used by http://www.ep.ph.bham.ac.uk/DiscoveringParticles/detection/spark-chamber/ Is there ...
-1
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1answer
63 views

Proposed experimental considerations of a micro-mechanical oscillator in a superposition state

This question asks for the experimental result that is theoretically expected or is known already from experience, when one considers the following two scenarios for the micro-mechanical oscillator ...
1
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2answers
30 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
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3answers
382 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?
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0answers
26 views

Surviving only on another's exhales? [closed]

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 ...
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0answers
17 views

Why do the fish appear to glow blue and orange? [closed]

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
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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.
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0answers
22 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
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1answer
53 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
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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
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2answers
20 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
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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
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2answers
74 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
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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
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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
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1answer
55 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
87 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} = \...
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5answers
60 views
3
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1answer
95 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
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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
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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
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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
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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
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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
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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
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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
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0answers
19 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
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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
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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
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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
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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
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1answer
30 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
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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
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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 ...
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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
62 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
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1answer
99 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 ...
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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 ...