# Questions tagged [experimental-physics]

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

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### Percentage uncertainty (average) of measuring tool

I am using a measuring tool and it provided me with $10$ measurements: $m_1 \pm u_1\%,m_2 \pm u_2\%,m_3\pm u_3\%, \ldots m_{10}\pm u_{10}\%.$ Note that these are not all measurements of the same thing....
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### Small crack in bottom corner of a beam splitter

I'm working with a Sagnac interferometer. To split a laser beam (He-Ne), we are using a cubical, non-polarizing beam splitter from Thor Labs (BS031). The beam splitter is fastened to a stand that is ...
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### Removing $1/f$ noise with lock-in-amplifiers

On the Wikipedia page for 1/f noise (at the bottom of the page) it suggests the noise can be reduced if the signal of interest is at DC. DC signals suffer from significant 1/f noise, so one method of ...
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### Is this correct? [closed]

For the physical pendulum I have derived the equation, $$T^2l = \frac{4\pi^2I_o}{mg} + \frac{4\pi^2}{g}l^2$$ my lab requires me to find g by using python. Am I correct in saying that if I plot $T^2l$...
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### What is required for a minimum viable Bell test experiment at home?

My objective is to create a tabletop Bell test experimental setup generating data of suitable quality for undergraduate education or satisfaction of personal curiosity; remaining free from loopholes ...
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### Difference between theoretical vacuum and experimental vacuum？

As is well known, the vacuum in QFT is defined by the lowest energy state of the total Hamiltonian, and particles are understood as elementary excitations above that vacuum. On the other hand, the ...
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### Best Fit with linear function and a problem of "zero"

I have experimental data on the dependence of the magnetic field (B) in the center of the Helmholtz coils on the current in it(I). ...
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### What evidence suggests that light exerts a force of gravitational attraction? [duplicate]

I'm aware of other posts outlining the theory of how light generates a force of gravitational attraction, cf. e.g. this Phys.SE post. I'm not so interested in this. I'm interested in what evidence ...
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### How can i predict the amount of time it would take for my heron's fountain to stop? [closed]

I was assigned a project for my physics class and I'm supposed to build a Heron's fountain and to predict the time it would take to stop so I can then check it experimentally. However, I'm unsure of ...
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### Which books do you recommend to learn more about the experiments that led to formulation of quantum theories?

I am trying to understand the evolution of quantum mechanics, mainly the experiments that led to the formulation of quantum mechanics theories.
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### Spacetime of a quantum measurement

In a classical(or wave) picture, when we measure a doppler effect from a receding galaxy, we are working on two wave crests essentially. Therefore, there are two events in spacetime for such detection....
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### How to get FFT spectrum of acceleration measurement?

I use an Accelerometer to measure acceleration (normalized via the gravitational acceleration $g\simeq9.81\,m/s^2$, so if one axis is orthogonal to the ground it returns the value 1). I already ...
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### Experimental detection of Anderson localization of light in 3D vs 2D

I have a question about the experimental realization of Anderson localization of light. I am a theorist, and have not worked much in optics, so please bear with me. Anderson localization of light in ...
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### Required characteristics of particles or forces that support 'psychic phenomena'

In Sean Carroll's book, The Big Picture: On the Origins of Life, Meaning, and the Universe Itself, pg. 156, he talks about how 'psychic phenomena' like moving objects using mind power is not ...
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### Home lab double slit "where to get lab quality slits?" :)

I purchased a small light table demo kit from thorlabs and I would like to setup a double slit demo. Thorlabs does not sell any double slits, and I am having a hard time finding a vendor that might ...
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### Have any experiments measured the empirical gravitational change with altitude?

I know theoretically it should decrease with $r^2$ increasing in the denominator of the equation, but has any experiment confirmed that this is approximately the change in gravity with altitude ...
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### What would happen to a quark if it could be isolated, into what particles it would change? [closed]

WP defines as quantum charge the $-\frac{1}{3} e$ charge value of the down quark and as elementary charge the -1e of the electron. The elementary quark particle cannot be isolated in the lab and its ...
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### Identifying the spectral lines of helium

I have recently performed an old experiment using a spectrograph with a photographic film having a helium spectral lamp as a source of light. The picture attached below shows the developed photo of a ...
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### The chronograph instrument error is 0.01s, so why should 10 periods be measured in calculation? [closed]

The experimental subjects have a period of less than 0.1s, and the resolution is not enough. If only one cycle is measured, it will be greatly affected by chance. how to figure it out? and also some ...
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### Experiment on nuclei decay [duplicate]

I have a doubt (I have already made a similar question, but slightly different): If I have a bunch of radioisotopes, and I would measure it decay rate and average lifetime, I measure for a time (...
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### Does "correcting a clock for gravitational perturbations" mean calculating the sender rate and attributing the sender rate to the sender?

Experiments which are interpreted in terms of "gravitational red- or blueshift" generally involve a sender $S$ (or a sample $S$ of individual senders), and a receiver (sample) $R$, which ...
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### When do we say that a given clock could be further corrected?

In a recent report on experiments with a sample of ultracold ${\rm {}^{87} Sr}$ atoms, T. Bothwell et al. (physics.atom-ph:2109.12238), the abstract ends and culminates in the following punchline: &...
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### Practical details on Fizeau cogwheel experiment

Fizeau measured the speed of light using the so-called Fizeau-Foucault apparatus. It consists, if I understood correctly, in sending light to a long distance (in the historical experiment, more than 8 ...
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### Paper showing evidence for Callan-Gross Relation

I am getting ready for a presentation and want to show a plot showing experimental evidence for the Callan-Gross relation. Are there any papers plotting this beyond 1970 across different $Q^2$ or ...
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### In the Aharanov-Bohm experiment, how are we sure that the electrons do not ever enter regions with $\vec B\neq 0$?

In the Aharanov-Bohm experiment, we say that the electron passes through a region where the magnetic field $\vec B=0$ but the vector potential $\vec A\neq 0$. The electron never passes through the ...
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### What is the Lorentz factor γ value in order to find the Larmor precesion frequency for the electron including the Thomas precesion correction?

I want to calculate the Thomas corrected value for the lab frame of the electron's Larmor precesion frequency using this equation: $$\omega_{s(g=2)}=\frac{e B}{m c \gamma}$$ I don't know what Lorentz ...
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### How do I find the exponent of the inner and outer radius of a rolling cylinder?

I just started physics at uni, and our first labb consists of finding a formula to describe the time it takes for a rolling cylinder to roll down a plane. They can be both hollow and solid. So the ...
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### Are Kepler's laws proven wrong recently? Or how were they Proven by Johannes Kepler just by observing

The Law of Orbits: All planets move in elliptical orbits, with the sun at one focus. The Law of Areas: A line that connects a planet to the sun sweeps out equal areas in equal times. The Law of ...
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### Why is the Pauli's exclusion principle not violated in the two neutron beams interference experiments?

It is my understanding so far that in this kind of experiments like the one measuring the 4π (i.e. 720° Dirac Belt trick) rotation characteristic of 1/2 spin fermions like neutrons, two neutron beams ...
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### Heating curve of water

If I am heating water in an open container with constant rate of heat supply (q) (water initially at 30°C ) until entire water converts to steam, the temperature (T) vs time (t) graph in sensible ...
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### Inverse Square Law of Radiation

I am conducting an experiment in which I investigate the relationship between the counts per second detected by a Geiger Counter and the distance between said Geiger Counter and the source of ...
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### Could processes and outcomes which are happening in colliders be simulated via mathematical model?

Colliding particles either for the purpose of getting fresh yet unexplained experimental results or as a mean of testing proposed theories appears to be a very crude experimental method. Could area of ...
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### How to find radial and tangential force for non-uniform circular motion? [closed]

I am currently studying the non-uniform rotational motion of a pulley under the force of a falling weight. If for instance we observe the motion of a black point mass on the pulley with: $\theta$= ...
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### Application of side lobes of the Airy beam

We know that the infinite-energy Airy beam is completely non-diffracting, which means that its side lobes will always exist. When it comes to the finite Airy beam, we can see from the experiments that ...
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### Anyone know what this physics lab equipment, found in the storage room, are? A resistivity kit or an optic bench? Any ideas? No identifying brand seen

1. 2. 3. 4. 5. 6. 7. 8. These equipment were found in the physics storage room. Unsure of how old they are or of their usage. They might be part of a resistivity kit or some sort of optic bench. Any ...
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### What is the difference between saturated and unsaturated photoassociation?

I was reading two papers and I came across saturated and unsaturated photoassociation. These papers are DOI: 10.1103/PhysRevA.66.063406 and DOI: 10.1103/RevModPhys.78.483. I am not an expert in laser ...
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### How do you stabilize the temperatures in your sensitive laboratory experiments?

I work in an AMO Lab, and I have been tasked with creating an experiment enclosure that will keep the air (and instruments) stable within about 50 mili-Kelvin with a set point of about 20C-21C. Our ...
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### Range of potential difference [closed]

What can be the maximum and minimum potential difference that can be applied on any kind of circuit experimentally? Like in theoretical terms we can assume any value but can a potential difference as ...
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### Generation of an beam with an arbitrary initial profile

Is it possible to generate a beam with an arbitrary initial profile? For example, the finite Airy beam has an initial profile $$\phi(s,0)=exp(\alpha s)Ai(s).$$ In practice, this finite Airy beam is ...
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### Is rotating Atwood Machine an example of UCM? (Uniform Centripetal Motion)

I was just wondering if the rotating pulley of an Atwood machine is considered as undergoing uniform circular motion? If we consider the system below, the rotating pulley undergoes uniform ...
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### Error in experimental verification of Newton's second law [closed]

I am doing a school lab to prove/derive Newton's Second Law from observation data that includes the force, mass, and acceleration. We are told to plot these variables accordingly, I already know $F=ma$...