Questions tagged [data]

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30 views

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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1answer
61 views

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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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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20 views

Historical estimates of the density parameter

From the reference in this answer I learned that our current estimate for the density parameter (i.e., the density of the universe divided by the critical density, which determines the shape of the ...
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2answers
39 views

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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13 views

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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1answer
37 views

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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34 views

An audio frequency spectrum of the star Alpha Bootis (aka Arcturus)? [closed]

Does anyone know where I might find an audio representation of the asteroseismological pulsation spectrum of the star Alpha Bootis (aka Arcturus)? In other words, what do the pulsations sound like if ...
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1answer
13 views

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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1answer
51 views

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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2answers
73 views

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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26 views

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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Are there any databases for astronomical measurements (specifically amount of dark matter per galaxy)?

I was looking online for amount of dark matter in certain galaxies. I couldn't find any data on google. Does any one here know a trusted database which contains amount of dark matter in galaxies? ...
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20 views

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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49 views

TIME Dilation - What is the best source of Data listing all candles used for calculating universe expansion (Speeds, Measurement Dates)?

I am researching the impact Time Dilation of Earth (Velocity not gravitational) has on the Hubble Constant and am looking for available data. Hubble's Orbit = 8,040 mps; Earth Orbit around Sun = 29,...
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16 views

Attenuation of acoustic waves in fluid media

Have spent quite a lot of time looking for some data on the attenuation of acoustic waves in fluids (preferably water or hydrocarbons) with little success. I figured this would be a good place to look ...
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1answer
30 views

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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1answer
33 views

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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1answer
34 views

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... ...
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174 views

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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1answer
53 views

What’s the difference between ‘decimated‘ and ‘undecimated’ data?

How is ‘decimated’ data different from ‘undecimated’ data?
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15 views

Where can I find the specific details of a gravity assist space mission?

I am writing a research essay where I need to know the specific details of a gravity assist mission such as Voyager 2's flyby of Jupiter for example (but any mission would work as long as it is a ...
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24 views

$N$-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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1answer
42 views

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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15 views

Any Open Source ship motion libraries

I wish to generate high volumes of fictional ship/maritime vessel track data - periods of several hours of random manouevres. At one level it's quite easy, since ship motion can be represented via ...
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1answer
54 views

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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1answer
30 views

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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1answer
22 views

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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1answer
33 views

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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2answers
27 views

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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36 views

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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26 views

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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3k views

Can data be transferred using the strong force?

We send data using the electromagnetic force, mainly over the form of radio waves, though this could be and is (mostly for human viewing of images) done with visible light. However, I want to know if ...
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34 views

How to compute spectral lines from NIST term data?

We know, that Hydrogen has line of 21cm in space. How can we (and can we) find the energy levels, producing these lines in NIST energy levels database? Other example. We know that Nd:YAG laser emits ...
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113 views

What does a negative percentage difference tell me about my results?

If I am trying to determine the percentage difference between two values, and I get a negative value for the percentage difference between two results, generally speaking what does a negative value ...
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2answers
64 views

Linear Regressions vs Algebra & Averaging in Solving for a Constant

I'm current taking AP Physics, and in both of the labs performed so far (Snell's Law/Refraction and Galileo's Inclined Plane), I have been trying to calculate some constant from a linear relationship ...
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2answers
717 views

Calculate acceleration and lateral G force from GPS coordinates [closed]

I have a data logger that records time (in tenths of seconds), latitude and longitude. I would like to calculate my acceleration and lateral G force based on the collected data. Is someone able to ...
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1answer
127 views

Should the electrical charge of $\pi^+$ (positive pion) be considered exact?

According to https://en.wikipedia.org/wiki/Elementary_charge, IIUC, electrical charge of an electron should be considered an exact value of 1.602176634 coulombs instead of an experimental value with ...
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33 views

The number of particles in PDG, and what the data includes

I checked here for computer-readable PDG particle data, and count about 174 unique particle IDs there, which seems like an awfully small number of particles to be "every particle type there is in the ...
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22 views

What Dimensionality Reduction method I can follow on a dataset that has Physics Parameter?

I am trying to model data related to Locomotive Train. We have a various set of parameters and we have the possibility to generate a few more parameters from this. Our model is currently using a lot ...
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1answer
43 views

Self-regulated stepwise evolution

Are there empirical examples of self-regulated punctuated evolution (with time)? This is when a quantity grows over time in a stepwise fashion, with each growth step having less amplitude than the ...
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2answers
176 views

Uncertainty for a given value

While including a data table for a lab report, the guidelines asked to include an uncertainty value for each raw data. In this particular lab where we used slotted masses the masses were already given ...
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1answer
71 views

How do LF Radio waves send data?

Excuse me I am a complete beginner. If LF radio waves are sent with let’s say frequencies of 100 kHz, how can data be modulated to that signal considering the signal is so long? For example, how can ...
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1answer
52 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 $D_1(2430)^{\pm}$. ...
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1answer
212 views

Double slit experiment/ fitting data to complicated sine function and vice versa [closed]

As part of analysing the double slit experiment, I've recorded position values for a number of minima and the central peak position. Also, I've conducted a single slit experiment (with unknown width)...
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2answers
74 views

What does a double parenthesis in a quoted value ─ like e.g. 157(3)(3) ─ mean?

Sometimes, in journal articles, the author writes a number followed by two parenthesis. For example, $157(3)(3)$, where it seems that the first parenthesis shows uncertainty in the last digit (here, $...
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2answers
111 views

What is the solar wind speed as function of distance from the Sun?

Someone must have calculated at least a "zero-order approximation" of the behavior of solar wind speed, density, and pressure as a function of distance from the Sun, but the heck if I can find it. ...
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0answers
205 views

Where to find databases from physics experiments?

In some lecture I want to write about data analysis in physics I want to show some real uses of data analysis tools in the analysis of data from real experiments. I tried to search but I couldn't find ...
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1answer
45 views

Measured Earth local gravity

I am looking for measured data of the local gravity on Earth. I know this website (https://www.ptb.de/cartoweb3/SISproject.php). The idea is nice but it looks a bit old and I would like to have an ...
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1answer
38 views

File with particle decay data [closed]

Does anyone know of a computer parsable file that has basic physics and decay data for (quite many) observable particles, such as mesons, barions, heavy leptons and $W, Z, H$? To clarify the data I ...