Questions tagged [data]

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Reflectivity of aluminium at ~234 kHz

I am currently trying to find values for the reflectivity of aluminium for 234kHz emf. I am doing an experiment to demonstrate the skin effect and need to account for signal lost due to reflection. If ...
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Where can I find spreadsheet of data containing resistivity vs temperature of Type I superconductors?

Where can I find raw data containing resistivity vs temperature of all the elements classified as Type I superconductors?
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Is there a downloadable spreadsheet of all known subatomic particles?

Is this Wiki page complete in its list of subatomic particles? Looking for a CSV or spreadsheet I can download and easily translate into code of all the possible subatomic particles. This page says &...
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4 votes
2 answers
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Rules of significant figures, precision, and uncertainty

In the physical sciences (which are physics, chemistry, astronomy, materials science, etc.), we learned that the uncertainty is +/- the smallest unit (which is 1) of the last significant figure if the ...
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1 answer
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Where can I find photon absorption cross-sections for various isotopes?

I am looking for absorption cross-sections for photons. Usually, I am dealing with neutron absorption where I utilize https://www.nndc.bnl.gov/endf/ for my data. This is a really handy website that ...
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2 answers
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Calculating error on manually chosen estimated fit

I understand that this should be basic knowledge, but despite searching all over the internet, I could not pinpoint the answer to this. Suppose I have data, and it can be linearised to a basic y=mx+c ...
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1 answer
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Where can I find redshift data?

Is there any database for redshift data of individual galaxies and stars for a long period of time?
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Is there data for natural background radiation measurement?

I am looking for raw data of alpha/beta/gamma particles natural background long-term measurement (preferably day by day or second by second for at least a few weeks), but cannot find any. I would be ...
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1 answer
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Prediction of constants with the standard model

I am trying to understand how the standard model predicts constants. Does it also predict fundamental constants such as the mass of the electron? And when looking at the result of the $g-2$ experiment,...
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1 answer
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What is the value of the exchange field in the 3d ferromagnets ($\rm Ni, Fe, Co$)?

I have been trying to find the values of the exchange field for Ni, Co and Fe. This website mentions, "Exchange forces are very large, equivalent to a field on the order of 1000 Tesla" https:...
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Experimental data set of quantum mirage or quantum scar

I'm interested in quantum scarring, and I would like to become more familiar with some actual data that support its existence by performing an exploratory data analysis. Where can I find a free and ...
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2 answers
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Public data to practice data analysis skills

Apologies if this is the wrong place to ask this, but I am currently trying to brush up on my data analysis skill in python as I am applying to data science jobs. I am trying to find some data that I ...
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2 answers
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How do I get the total acceleration from 3 axes, in negative?

For a project, I'm working with acceleration data recorded by triaxial accelerometers. This means that I have accelerations in the x, y, and z axes. I found the almost exact same question from a few ...
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1 answer
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Availability of dataset from "Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres"?

I am looking for the most-raw data from the (in)famous Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres experiment. I would like to try repeating their ...
2 votes
1 answer
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How to obtain position data from acceleration without forward euler?

I am doing a investigation into the Wilberforce Pendulum and in order to find the position and rotation at any time I have attached my phone onto the pendulum in order to use Phyphox, a app that finds ...
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1 vote
2 answers
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What Data Set(s) Would Be Best For Head-To-Head Unified Field Theory Model Selection?

I'm seriously considering establishing a prize for unified field theories in-line with my history of prize awards, such as the fusion legislation I drafted with a cofoudner of the AEC's program, the ...
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33 votes
5 answers
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How is data transferred between devices?

If you send a text from your phone to your friend, do electrons move from your phone to your friend's phone? How is text transferred (physics wise)? I am a programmer and I want to know how it is ...
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2 votes
1 answer
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Is there a Maximum Data Density of a Physical Volume?

Is there an established or proven relationship concerning how much data can fit in a given volume of space / spacetime?
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Am I applying this vector-based equation correctly to my dataset? [closed]

A coworker and I need to perform what is probably a simple calculation with our data so that we can calculate something else. However, our vector calculus skills are rusty and we don't know if we ...
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How many bits of storage would be required if we are in a simulation?

The answers here didn't really address what I was looking for (How many bits are needed to simulate the universe?), so... If we are in a simulation, can we presume the simulation only needs to be ...
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1 vote
1 answer
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How exactly does magnetism rip data from things?

I once read in a book that if a magnetar were to pass by the earth that it would rip the data from every single credit card on the planet's face. I'm not entirely sure if I'm in the right place for ...
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1 vote
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What is the theoretical upper limit, if any, to the quantity of information bits that can be encoded within a given volume of space? [duplicate]

By encoding I mean representing bits of information as some form of mass-energy that can be, at some time in the future, decoded back into the original information bits without loss. This does not ...
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1 vote
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Determining loss of intensity in a slow neutron beam after passing through a metal plate [duplicate]

I am looking at a question dealing with the loss of intensity of a beam of slow neutrons with initial intensity $I_0 = 5 * 10^5$ N/sec as it passes through an aluminum plate that is $3$ cm thick. I ...
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Is there any website or method to calculate the refractive index of gases like $\rm CO_2$ in the mid IR?

I want to know the complex refractive index of some gases like CO2, CH4, C2H6 .. etc in the mid infrared. Is there any website, software or a method to know them?
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Where can I find the true anomaly of the planets on Jan 1st 2000?

I am trying to code a simulation of the solar system. At present, all the orbits seem correct but I'm placing the planets at their respective periapses at the start of the simulation so the relative ...
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2 answers
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How to get spectral data of Sun?

I am doing project in blackbody radiation and i am about to analyse the spectral data of the incandescent lamp, hot metal, Sun and Sirius A. So i can find the displacement of the peak of curves using ...
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1 vote
1 answer
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Rate of evaporation of water vs temperature. Where can I find data?

The story If there is an easily understandable problem that fascinates me compare to apparently how hard it is to model and solve accurately, and how little it has been studied, the time to cool down ...
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2 votes
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Calculate orbital speed of object around earth (SpaceX data)

I am just reading SpaceX rocket data satisfies elementary Hohmann transfer formula, a paper of how to use SpaceX telemetry data in educational physics. In particular the paper contains the following ...
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1 vote
2 answers
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How are the locations of solar system planets expressed in their orbits?

and where can I find the data about the locations of the solar system planets during their entire year? I would like to find the data on the orbits of solar system plantes. Also I would like to know ...
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Research on exoplanets using available data from TESS

I am a high school student who is proposing research on exoplanets for my junior research project, I have several questions: I have seen studies where researchers survey star systems and then find ...
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1 answer
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Speed of field and data in wire

The speed of field in wire is near the speed of light (speed of field not electron) so why speed of data is in MBPS, I mean why a byte dose not transport with light speed (field speed).
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1 answer
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Pseudo-potential form factors for gold

Can anyone suggest a reference in which I can find the Fourier coefficients of the pseudopotential of gold? I cannot find them anywhere in literature. I need them to compute the role of plasmon decay ...
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Is there a standard distance/z data set for cosmology given new measurements?

I've seen this data set in a few places. Found here: https://lco.global/spacebook/light/redshift/ Do the measurements from SH0ES and Planck that cause the Hubble tension alter this table? I can find ...
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-1 votes
2 answers
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Single galactic proof of Dark matter?

I've heard tell that many galaxies have visible mass profiles which do not match up to a predicted Gravitationally Newtonian velocity distribution. Can anyone here find me an accessible paper of an ...
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What is the difference between horizontal units and horizontal scale at an oscilloscope?

This is a picture of the data of a given measurement by an oscilloscope. I would like to know what the difference between horizontal units and horizontal scale at an oscilloscope is. I would be so so ...
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Is there a tabulated reference for CO$_2$ reactions showing entropy and free energy?

With all the climate change attention I am hoping to find a CO$_2$ reference that can help me find a $\text{CO}_2$ reaction with $\Delta \text{S}^{\circ}$ less than zero, and ideally $\Delta \text{G}^{...
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Experimental Data for Contact Angles

I am doing some experiments with contact angle of liquids on chrome stainless steel and was wondering if in the literature there is already experimental data for contact angles of different fluids on ...
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1 answer
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Where can I hear the trapped sounds inside a pulsar?

I have been searching for an audible track of stellar oscillations inside a pulsar, but I don't seem to find what I want. No, I am not asking about the radio waves emitted that have been converted ...
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1 answer
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What is effective mass of electrons and holes at room temperature of Al${}_{0.52}$In${}_{0.48}$As?

I'm searching for those values, but usually they are given at very low temperatures, usually 77K or 4K. I'm looking mostly for bulk values. I was thinking of applying Vegard's law to AlAs and InAs... ...
5 votes
2 answers
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Does data compression require energy?

Suppose I have a $C=1TB$ hard drive $H$, filled to the brim with English text. I'd like to compress this. Suppose the hard drive consists (abstractly) of zeros and ones, and that the number of ones in ...
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1 answer
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What’s the difference between ‘decimated‘ and ‘undecimated’ data?

How is ‘decimated’ data different from ‘undecimated’ data?
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1 vote
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$N$-body simulation with varying neutrino mass

I am trying to find a picture of the $N$-body simulations that shows the LSS. Particularly I am looking for different neutrino masses without the CDM. For instance pictures likes this But with more ...
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1 answer
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Is there an authoritative data source for EM spectrum assignments?

I'm working on some software to coalesce various standard constants (eg SI, CODATA, AME) into an easy-access library. However, trying to find an authoritative source I can find for EM spectrum ...
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Where could I find a reliable source that states all the existing radioactive decays?

According to searches on many sources on the web and books, I could merge informations to deduce that the general possible radioactive decay modes are the following: $\alpha$ (proof that this is a ...
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1 answer
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What is a good database of galaxy luminosities?

I need to do some mass/luminosity relationship calculations. Where can I find good, referenceable absolute luminosity data?
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1 answer
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Analysis with CMB Data

I have read about Cosmic Microwave Background Radiation from Weinberg's Cosmology Book. I'm looking forward for specific resources to analyse real time CMB Data recorded by Physicists. Any papers, ...
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1 answer
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Understanding the 2007 PDG-Review on Constants

I have a question concerning the following table: http://pdg.lbl.gov/2007/reviews/consrpp.pdf Let's take the Weinberg-mixing angle as an example, whose sine-squared is stated as $$\sin^2 \theta_W = ...
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2 votes
2 answers
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Finding Value for Sine Squared of Weinberg-mixing angle

I am searching for an official value of $\sin^2\left(\theta_W\right)$ with an error estimate, where $\theta_W$ is the Weinberg-mixing angle. Since I didn't find this value in books, I searched on the ...
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1 vote
0 answers
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Coefficient of static and kinetic friction of brass over aluminium, brass over wood and brass over perspex plastic

Hi can someone please help with a reference to the following constants static and kinetic friction of brass over aluminium, brass over wood and brass over perspex plastic. I am just looking for a ...
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Causes of dB level increasing over distance from source?

I was given some data taken from three microphones placed at three different distances (25, 50, 100 ft) from the railroad track. The sound level increases by 7 dB from 25 to 50 feet and about 1.5 dB ...
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