Experimental Definition and 494 Threads

I have conducted a tensile test on five specimens. I intend to do a linear regression for every set of data and get a value for the slope (modulus of elasticity) and its error by finding the standard deviation (using LINEST function on excel) of the slope. I will now end up with 5 slope values...

Quantum theory, although hard to understand with intuition has a lot of experimental proof. Do the more modern theories e.g. String theory, or black hole theories have any experimental proof, or are they theories that the mathematics have led to? Without proof, do they deserve so much credit...

Is a classical universe (with a deterministic dynamics) compatible with assuming that experimental choices can be made arbitrarily? This question arises from the following statement of Bell: that I had cited (with a reference) in https://www.physicsforums.com/posts/5694545/, and commented...

Everything I've seen about Bell's inequality has had the setup of 120 degree angles between the axis of measurements. The experiment then proves that the basic hidden variable theory can't be true. But the actual measurement has always been told to me as a 0.5 correlation. 50% of the time the...

A. Neumaier submitted a new PF Insights post Vacuum Fluctuations in Experimental Practice Continue reading the Original PF Insights Post.

i want to get a better understanding of quantum mechanics (specifically for the multiple particle case) and came to a point where looking deeper into the theory won't yield the answers i seek. so to my discomfort i fear i'd need to look at experimental results to extend my understanding. so my...

I have been researching a question I have concerning the speed of light in magnetic AND electric fields. I came across an article in arvix but could not quite understand what they were saying. I am not a scientist I am just curious. There was a statement in which was shrouded in a strange...

I'm currently undergoing an assignment in maths were it is is necessary to apply mathematical concepts to aspects in reality. Hence, I have chosen to model the radioactive decay of iodine 131, however I am required to plot the data of the radioactive decay of iodine 131, in order to find the...

Hello folks, When you study a pendulum or the path followed by a ball falling under gravity the first thing you have in mind is the experimental result, because you can actually see it. It is easy to measure or find the position and velocity of those systems. If we talk about a particle with...

Hi all, I'm currently a second year Applied Maths and Physics student. I will be specialising in Experimental physics next year. With this, I will have no more core (mandatory) mathematics modules. So far, I have taken, Linear Algebra I, Calculus, Differential Equations, Linear Algebra II...

How can we determine the system properties (natural frequencies & damping ratio ) practically using forced vibration? One way is to measure the phase angle, using the bode plot, the exciting frequency corresponding to 90 (deg) phase shift should be the natural frequency, are there any other...

Hi all, I have recently done my first experiment in fluid mechanics, and it was a gravity current experiment using UDVP. I have augmented the data, as to remove noise, and performed the statistical analysis. I have text files which contain the velocities measured by each sensor over the time...

Homework Statement Hello everyone, I am trying to figure out how to approach part c, parts i and ii Homework Equations OK. I know that we have the current equation in milliamps as shown above The Attempt at a Solution My problem is giving one possible explanation for the finding and...

I am unsure about what branch of physics I should get into. I am very interested in astronomy, but I also think I would enjoy working with lasers and designing experiments. What field would you say is more interesting? Also, pay is very important for me. If I can't afford to go to school and...

Hi again, probably this seems to be a simply question, but in last days i becomes a really strange one. We all know that there are many kinds of constants in physics, some of them, are found experimentally with great accuracy in too expensive projects, but no matter how accurate can be measured...

http://imgur.com/a/8B1EV http://imgur.com/a/8B1EV http://imgur.com/a/8B1EV As shown, an X-ray tube (source) is striking a fluorescent plate. The source has a large angle (100+) that the rays are emitted. How is radiation distributed (spatially and energetically) in this set up? Does this...

Hi all! For a talk I want to compare the values of the critical exponents found by Wilson and Fisher in their \epsilon = 1 paper (10.1103/PhysRevLett.28.240), with the experimental values measured up-to-date. Can anyone provide a source for these measured values (\gamma, \nu, \eta)? Thanks...

Hi, I like mathematical physics and experimental physics, is it possible to change from one to another of these fields after earning PhD from one of them? Thanks

Despite some effort I still don't understand how Coulombs law can be used for experimental search for mass of photon. From wikipedia: If a photon did have non-zero mass, there would be other effects as well. Coulomb's law would be modified and the electromagnetic field would have an extra...

In multiple-electron atoms the effective charge of nucleus for a given electron, is reduced by the presence of other electrons (including those from more external shells, against the shell theorem): Z_eff = Z - s where the screening constant s depends on Z and the concerning orbital. It is...

How would one calculate the drag on a projectile (in this case a 1cm3 cube) that was launched at 0°. The vertical drop, initial velocity, distance, and time (taken to travel distance) where measured. I want to say that I could compare these experimental drop (bellow hight that projectile was...

Homework Statement First question on PDF: http://ars-chemia.net/Classes/102/Problem_Sets/Practice%20Exam%20for%20Exam%201%20Key.pdf Homework Equations I used the initial rates method: Rate2/Rate1=k2*[A]^m/k1*[A]^m The Attempt at a Solution When I solve these types of problems with the...

Hi all, What is the tool which can add my Listplot graph like: to an experimental figure as following: such that the (x-y) axes coincidence in both figure and graph: Actually I tried Mathematica as: data27 = Import["~/Events/scan.dat"]; idata27 = Table[{data27[[i, 2]], data27[[i...

Some problems in physics are theory experiment. We have some tools, and we must find some equations for measuring. Example: Find the magnetic moment ##\mu## of the magnet if we have clock, circular wire loop, and electrical circuit. We must find the period of oscillation of magnet. In that...

I am a theoretical physicist who would like to learn more about experimental physics. I will not work in a laboratory, so I do not need practical technical details. What I need are the general ideas and principles of various experimental techniques. Also, I don't want a book dealing with only...

Hi ! I'm not sure to post my question in a good place so please move if inappropriate... I search experimental data of bremsstrahlung interaction as we can found experimental data of nuclear interaction on EXFOR. Someone know a website which provide that ? Thanks in advance !

Currently I am studying a double major in Math and Physics, hopefully leading towards experimental physics, however come next semester I will have to pick my math "specialisations" from two of applied math (mostly chaos and optimisation etc.), pure math(mostly abstract algebra and analysis) and...

Is there any experimental evidence that pure energy (massless) can curve spacetime?

Does such a thing exist ?

Hello everyone help please I need to fit experimental data with a theoretical model using the MATLAB software what is the best way to do it? thx for advance

Homework Statement I have performed a chemistry experiment where I analyzed how the diluting of two reactants with the same volume and initial concentration impacts the percent yield of a precipitate product. Thus my IV was concentration and my DV was percent yield. My question is what is the...

This new research suggesting Debroglie/Bohm pilot wave theory may yet have legs sounded compelling and I would love to hear the thoughts of the PF community: https://www.quantamagazine.org/20160517-pilot-wave-theory-gains-experimental-support There is some discussion in the comments by Wiseman...

I wanted to ask something that should have been asked in the past... What are the chances to find a PhD in Astroparticle Physics [Experimental] if you have done something with LHC/ATLAS at your masters, mainly associated to data analysis and not hardware? Thanks.

Hello I wish if anybody can enlighten me about experimental solid state physics. What they do every day? I mean who enroll in this major what careers they can find after completing their master degree in it? Is their a ph.D related to this major?

Homework Statement A student is testing the kinematic equations for uniformly accelerated motion by measuring the time it takes for light-weight plastic balls to fall to the floor from a height of 3 m in the lab. The student predicts the time to fall using g as 9.80 m/s^2, but finds the...

Homework Statement Measure the density if air at normal atmospheric pressure. You can use the following equipment: One scale with an accuracy of 0.01g Two empty glas bottles (≈0,33 liter each) One big bowl with water One cork with a valve and a vacuumpump Homework Equations Not knowing how...

Hi everyone, I'm current working on a project about special relativity, and i was thinking writing about the cosmic ray muons. But where do i, as a high school student get raw data of cosmic ray muons? I have searched quite a bit, but it doesn't seems like data like that is public and easy...

http://news.mit.edu/2016/ligo-first-detection-gravitational-waves-0211

Hello, I will be conducting an experiment to create a sugar monocrystal, the device I will be using (apologies, English is not my primary language therefore I do not know all the proper terms) will be modeled and influenced by the one described in the paper "Soft-sensor for industrial sugar...

Homework Statement I did a lab on the experimental application of Hess's law. There were two experiments where a substance in a solution was dissolved and the temperatures were recorded. Then the standard heat of formation for the substance was calculated. The first experiment used MgO and HCL...

I've been looking for the specific experimental evidence as to why we know mass increases with velocity. The only way I can think of is with gravitation. If so how do we experimentally know that (as I've been told) increase in observed mass relies on the total relative velocity of the moving...

Hello Lately i have been searching for what to do in university and i decided to go for physics because i am passionate about it. Then i visited the campus of the university i am planning to go into and had a talk with the physics department chairman , he told me that if i had a PhD in...

I am writing an essay which includes the experimental "verification" of a theory. As it turns out, the theory was able to predict a certain variable F's direction of change (i.e. increase or decrease across two data points) "correctly" for 90% of the time, and predicts the value of F at each...

Hi Guys, I studied physics for my bachelor but still I am not a super expert, although I am still working closely to physics (but not so much astronomy). I was wondering if it would be possible to build a radio, or some other devise (any ideas?) that could be tuned at the frequency where the...

Homework Statement Okay so we're testing the effects different types and number of layers can have the heat released through conduction. in our results we found that the heat released was reduced by 50% for 2 layers compared to 1 layer and that the heat released was reduced to 34% for 3 layers...

Hi all, I am currently operating a piece of equipment that essentially collects particles and separates them based on their size. Essentially you have 8 stages, and each stage has a differing size of particles it collects. For example: Stage----Size of Particles (D) (um)-----Mass Collected (M)...

So this question is from a physics lab. The apparatus for the experiment was made upon a device that measures angular speed over time. On top of this is a rail to which different items can be attached. Directly in the center of the rail is a device which has a pulley with a string to attached...

Hello, I will be doing an experiment to separate N2 from O2 in air using membrane separations. I need to write my own experimental procedure to find the objectives of the experiment. Here is our experimental set up I'm trying to figure out how to do objective i. I need to figure out the...

Homework Statement [/B] This is not a typical homework problem, so I hope I am posting this in the correct place. I am in 12th grade physics and we are dealing with basic kinematics. However, we recently did a set of problems that I did in a way which makes sense and which our textbook (and the...