Questions tagged [experimental-physics]

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

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Is there any technique to grow a pile of atoms on a surface?

I would like to know if there's any experimental technique that can grow a pile of metal atoms on a surface (preferably the same metal). As for the shape of the pile, something like an atomistic cone ...
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Experiment Related Problem [closed]

There's life on Zoopledorf! While on a routine patrol in your spacecraft outside the planet, you and your colleague Captain Clark encounter an unknown spacecraft, presumably crewed by Zoopledorfians. ...
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What is the evidence (experimental observation) that elementary particles have spin angular momentum?

From what I have read here, the concept of spin is attributed to a calculation based on a mathematical model using quantum mechanics. For example, How can a particle with no size have angular momentum?...
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How to control dew condensation when shooting tracks in a diffusion fog box?

I got dry ice, so I made a diffusion fog and tried to shoot the track. So I created a diffusion fog box with the following steps: I prepared a circular plastic container with a radius of 6 cm. Next, ...
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1answer
36 views

Operationally, how do I choose between measuring position or momentum?

First a simple example to illustrate the essence of the question: If we have a spin half particle in the $S_z+$ state and if one wants to choose from either measuring $S_z$ or measuring $S_y$, which ...
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2answers
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Muon neutrino and electron neutrino discoveries and their Nobel prizes

In this lecture, around 44:00 https://youtu.be/KU94cMZif8Y?t=2635 The lecturer mentioned quickly that the 2nd neutrino (of muon) results in a Nobel prize earlier than the 1st neutrino (of electron's). ...
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AdS/CFT-oriented reviews of experimental techniques?

I am doing a PhD in AdS/CMT. In order to have a better understating of the physics of the systems the correspondence aims to describe, I am looking for accessible reviews or online seminars about the ...
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Lab Report Writing [closed]

I am need some suggestions on how to write a good lab reports on my own. I am a first year computer engineering student and in my physics course; waves and field, I have to write a lab report every ...
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2answers
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Is virtual particle a relativistic or non-relativistic effect?

A virtual particle is defined to be the internal line in a Feynman diagram which usually mediates force. I'm wondering if it's a pure relativistic effect? If the system is non-relativistic (quantum ...
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1answer
32 views

Experimental foundation of particle number conservation

How can we prove that the charge is conserved in particle experiment? Or lepton and baryon conservation. I think it is easy to say that the charge is conserved, but might be hard to measure. I guess ...
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What's the insufficience and influence of standard model [closed]

standard model is a milestone achievement of modern physics.However, it still has some insufficiences, my question is: first, what are the main insufficiences of standard model? second, is standard ...
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43 views

How to measure gauge boson?

note that it's taught that in standard model particles that mediated weak interaction force are gauge bosons: vector particles, spin 1, take one charge. I'm wondering how to prove these properties in ...
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54 views

How mass of a nucleus can be measured?

I know that mass of an atom can be measured using mass spectrometer, but how mass of a nucleus can be measured? simply by subtracting total electron mass of that atom? or there are other professional ...
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The correction of the lattice heat capacity

Some articles extracted the magnetic and electron contribution from the heat capacity by subtracting another isostructure compound (e.g. $C_p(\rm{CeRhIn}_5)-C_p(\rm{LaRhIn}_5)$). Are there any ...
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What does the notation $8.9875517923(14)$ mean? [duplicate]

The number $8.9875517923(14)$ appears in Coulomb's constant. I have read that it has something to do with the uncertainty of the accuracy of the number but answers have been unclear. Can somebody ...
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67 views

Has the ballistic motion of an electron in gravitational field ever been measured?

Reading this question I thought of an argument that an electron's trajectory would bend in the gravitational field despite the electron's being incapable of strong interaction; this would then ...
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30 views

In the Stern-Gerlach experiment, did right-handed spin-up particles go towards the North or South magnetic pole?

Just as it says above... I cannot find a straight answer, and I have tried...
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2answers
109 views

Davisson and Germer experiment

I was reading about the experiment that confirms the wave particle duality as we see a sudden rise in galvanometer which was explained as a phenomenon of constructive interference. Is it possible that ...
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45 views

How to measure the lifetime of a particle experimentally?

I'm wondering in experiment, how can one measure the lifetime of a particle, because it is a very short time. Also, I'm wondering how experimentalists measure the mass of the particle, which is also ...
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Measuring electron spin

How do experimental physicists measure the angular momentum for the spin of an electron? A paper about an experiment would be helpful. Alternatively, how was the electron spin value of $\hbar/2$ ...
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1answer
53 views

Why supersymmetry can only be verified in high energy level?

I'm wondering why supersymmetry can only be verified in high energy level,can we check supersymmetry in low energy physics?
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1answer
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Is it possible some of a beta decay's energy goes into a strong recoil against the nucleus?

Reading about the 'history' of beta decays and neutrinos, I learned that some early-twentieth-century physicists and chemists thought that the 'missing energy' of beta decays didn't go into Wolfgang ...
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31 views

Error propagation in expression with trigonometric functions

In a physics lab inclined plane experiment, I am calculating the kinetic friction $\mu$ using the formula: $$\mu = \tan\theta - (a/g)\sec\theta$$ Here $a$ is the acceleration and $\theta$ is the angle ...
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1answer
91 views

Silly question about black hole analogues: is it possible do construct an “at home-DIY” experiment?

First of all, to the fellow Physics Stack Exchange community: I'm a undergraduate student with knowledge on basic General Relativity (GR). I do not asking this with an aim to extract relevant ...
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Rutherford experiment and particles [duplicate]

The Rutherford experiment proved that the Thomson model was incorrect and the Rutherford model was the right one, this because the $\alpha$ particles were deflected by the nucleus and in the Thomson ...
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Calibration of Hall Effect Measurement using Standard Reference Material (NIST)

I would like to calibrate a low-temperature Hall effect measurement using a Fe SRM. Are there any standardized Hall measurements of SRM's available?
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2answers
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Why dilute gases do not form crystals at low temperatures?

I was wondering why a dilute gas (e.g. rubidium) forms a BEC at low temperatures rather than a crystal. My (naive) reasoning goes as follows: The dominant interaction between two atoms at low ...
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1answer
25 views

Galactic structure vs distance from earth (ie age)

In both theories of galactic formation, top-down and bottom-up, we understand that galaxies become increasingly structured as they age. By increasingly structured, I mean they are more spiral or more ...
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1answer
47 views

Measuring cold/cryogenic objects without touching them?

A common way to measure temperature on the scale of household objects and cooking is to use an infrared thermometer. The basic idea is to look at the thermal emission of infrared light from an object ...
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2answers
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Is it practically possible to make an air conditioner more energy efficient?

I have had this thought for a long time that an air conditioner is connected to an exhaust device that pumps hot air away. However theoretically it should be possible to channel that air flow into ...
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1answer
44 views

What happens if we rotate one gear and this rotates another and this to another and so on. Will the last gear rotate faster than light?

what happens if we rotate a small gear attached to a larger one and the large one rotates another small one attached to a large one and the large one rotates another small attached to a large one and ...
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How to measure isospin?

In solid state physics, spin can coupled to orbital momentum in the presence of external field like electromagnetism. Since spin and isospin are both inertial degrees of freedom, I'm wondering if ...
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1answer
29 views

Why is a laser used to split a BEC in half?

In a youtube video, a German physicist Wolfgang Ketterle showed that two halves of the condensate creates interference pattern as though they are waves. I paused the video but still unable to ...
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How can the possibility of tritium contamination decay be removed from XENON1T or XENONnT data?

The abstract of the new arXiv preprint Observation of Excess Electronic Recoil Events in XENON1T contains the following sentence: The excess can also be explained by β decays of tritium, which was ...
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What is significant in broad and narrow resonance peak to internal structure of the resonance?

I read about the multiquark system and It seems like many people said that a narrow peak mostly likely to be a molecule structure. The broad peak seems to be a compact structure. This is like a kind ...
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1answer
70 views

Distinguish between measuring devices and 'sources of unitary evolution'?

In a quantum optics lab, imagine that we are given with a collection of experimental tools to set-up an experiment on an optical table. This collection could consist of devices like photon detectors, ...
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What determines how far an incident stream of electrons will penetrate a material?

In the Davisson Germer Experiment, we assume that the incoming beam of electrons undergoes surface diffraction when it hits the nickel. That is, we assume all the electrons hit the top most layer of ...
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2answers
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Activity of a radioisotope after an hour of irradiaton

Suppose that you irradiate a beam of monoenergetic alpha particles on a target. You can determine the saturation activity using Saturation activity = $\frac{R_a x \sigma \rho N_A}{A}$ But how do you ...
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Dancing behavior of a droplet

When a small droplet is dropped on a extremely hot surface (at around $220^\circ C$), it shows a dancing behavior by moving around fast on the surface. What is the concept behind this bizarre behavior ...
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1answer
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Why is photocathode damaged by excessive photocurrent due to exposure to intense light?

Many books including the book (Hamamatsu, "Photomultiplier Tubes", link to PDF) says that a photocathode of a photomultiplier tube is damaged by intense light. Do not expose to strong light....
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Beams of different colors do not interfere with each other [duplicate]

Experimentally I know that two monocromatic beams of different colors or orthogonal polarizers do not interfere with each other (so the interference coefficient is zero). Theoretically, why does that ...
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Confusion between statically determinate and indeterminate beams

Why is it that statically determinate beams can take some degree of misfits without any generation of strains or stress, but not statically indeterminate beams?
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What is the remaining values of $\tan{\beta}$ of MSSM, not excluded by experimental searches?

What is the remaining values of $\tan{\beta}$ of MSSM, not excluded by experimental searches ?
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Where in experiment do you encounter Lorentizan wavefunction?

Is there an experimental system, or such that can be observed in nature where a particle's wave function assumes a form - $\psi(x)\propto \frac{1}{\sqrt{x^2+1}}$ such that $|\psi(x)|^2$ is Lorentzian? ...
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Lightspeed - what do we measure? Wave group, phase, front and signal velocities

I'm studying for an experiment of measuring the lightspeed c. It will be measured following the rotating mirrors method by Fizeau-Foucault, using a HeNe laser. I could understand - and visualize - ...
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Statistical tension between two measurements [duplicate]

If we have two measurements of the same quantity, say, $m_1=a\pm c$ and $m_2=b\pm d$, how many sigma away are these values? In other words, when we say that two measurements are in e.g. $3$ sigma ...
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27 views

What was Faraday's experiment's of induction?

I'm searching about the experiments, which Faraday has done in order to discover the electromagnetic induction phenomenon. I didn't find what I need on google scholar nor google books. Can you ...
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Natural and man-made nuclear transitions [duplicate]

I am currently studying nuclear physics, but in this concept, I could not find any related topic for this on the internet. Can someone suggest any references?
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Relationship between resonance frequency of a cup and amount of water filled

For a science project I chose to investigate the relationship between the resonance frequency of cups and the amount of water filled in it. I filled the cup with 10 grams of water each time, and used ...
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1answer
53 views

Is this $CL$ or $CL_S$ method?

I have already posted this problem here, closed for asking too many questions. I will reproduce the introduction and contextualization here, and try to ask a more specific one that I hope will be ...

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