Experimental Definition and 494 Threads

I am A Ph.D em Chemistry and not so good in High Mathematics than most of you. Therefore forgive me if, if my idea is a little bit naive. Superparticles as an evidence are dificult to create, because of hughe energy ammounts necessary for it. But I was told that our STRINGS are much, much...

I am starting a project to develop, with a very diverse team, an open source, modular, web-based teaching tool for math, science, and engineering courses. Here is a link to the full project description...

Ok so I've been wondering, how is it that physicist's EXPERIMENTALLY determine the ground state configuration of electrons in a particular atom? In other words do they use emission spectra/thermodynamic calculations/etc? Also, if ground state represents an atom's minimal energy state, which...

Can anyone point me to a good source using the Schwarzschild metric that gives Einsteins predicted result of the measurement in Principe?

Homework Statement For my physics lab, we have to calculate the speed of sound through steel and aluminum based on an experiment we did using a microphone and a program called Logger Pro. The resulting graphs gave the frequency of the sound of the aluminum rod as 2109.38 Hz, and the frequency...

I know that buffer capacity is defined as the ability of a buffer to resist pH change. I'm trying to calculate the buffer capacity of my buffer. I added NaOH to it until a significant change in pH, usually about 2 units. So when I calculate, should I do exp. buffer capacity = (moles NaOH /...

Sorry if this question has already been asked many times, but I found no answer after a quick search. Have already made an experimental test of the Heisenberg's inequalities: \Delta p \Delta x \geq \hbar I'm quite sure our instruments' imprecision are larger than Planck's constant, but I...

Experimental "measurement" of Einstein's Field Equations The question is essentially: What if we took a strictly experimentalist view, and considered a phenomenological model for gravity that is a "generalization" of EFE: R_{\mu \nu} - C_1\ g_{\mu \nu}\,R + C_2\ g_{\mu \nu} \Lambda = C_3\...

I have been reading quite a bit about bell pairs lately and would like to know about the actual experimental behavior of them. Here is a summary of my current understanding: Take two particles A and B entangled in such a way as the spin of each is opposite to the other, or in other words, a...

i was wondering what the major differences between a bsc in theoretical Physics and experimental physics.. and if you are in one please indicate why you chose that one over the other?

It is my understanding that the world of physics is split by a fast chasm into experimental and theoretical physics. The first time I told my father I wanted to be a physicist, he asked me “experimental or theoretical physics?” I thought for a second and responded “both!” He went on to explain...

Homework Statement This was part of a lab i preformed to determine rate law for HCl and Mg. 50 mL of 0.5M, 1M, 1.5M and 2M HCl solutions were made using water and this was used with Mg ribbon to find the rate law. The same 0.5M, 1M, 1.5M, 2M HCl solutions were made in 100mL solution that...

One of the simple experiments for simply observing Hall effect was done. However, I have a problem with the experimental results (attached .xls) First the current in the solenoid was varied while the current in the Hall Probe was constant. Then the current in the Hall Probe was varied while...

Where do experimental particle physicists work like those working in lattice quantum chromodynamics for example and other experimental particle physicists?

There are 14 bottles of wine and one is tainted such that, a single sip of the tainted bottle is lethal. It takes up to 24 hours for full effect of the toxicity. If you have only 4 lab animals to test all 14 bottles of wine; what experimental design might you use, to determine which bottle was...

Why is it that if you have two data points a \pm b and c \pm d whose uncertainties are symmetrically distributed, the sum of the points is a+c \pm \sqrt{b^2+d^2} Can someone please help me with this derivation. Also, another separate question, suppose I have many uncertain data...

Hello everyone, does anybody of you know, whether there are some publications/blog entries/ideas/anything on possibilities of experimental verification/falsification of Loop Quantum Gravity at collider experiments? I know, there are predictions that can be tested with astrophysical...

First, if there are tests that have ruled one way or the other, that pretty much ends this discussion. I couldn't find any, but if they exist please point them out here. That leaves the discussion of: 1) How could these been distinguished experimentally, and 2) How precise do tests have...

Hi guys, can you guys point to me what are the recent experimental results that show that cells can be induced to make a pluripotent cells?

In electrostatic case, Gauss's law can be derived from Columb's law, so we can regard experimental evidence for Columb's law as evidence of Gauss's law. But what about non-static case? In this case we know columb's law is no longer valid, so we need experimental evidence to justify Gauss's law...

Delayed choice in half silvered mirror or double slit For now, I am focussing only on the half silvered mirror: there are two paths/arms that are created. My question is: 1. If a detector/obstruction is placed on either of the two paths after the photon has passed but before its hit...

Hey everyone, New to the forum - I apologize if you already get heaps of posts like these... Im in Year 12 Physics, and out first assessment piece is related to the physics of sport. It's a typical physics project -> hypothesis, testing, report...etc We're looking at anything relating to...

I have been reviewing Sakurai's treatment of the SG experiment by analogy with polarized light, and I realized that I am not sure that I really understand how to construct in a laboratory the SG_{y} filter to produce and separate the \left|S_{y};\pm\right\rangle states that are analogous to...

Homework Statement I'm new to uncertainty, so I needed a little assistance. The circuit in this experiment was simple, a dry cell connected to a variable resistor. I used an ammeter on the circuit and used a voltmeter across the resistor and took some measurments. The experiment was to...

hi everyone ! when we say (for example)a,b and c are the dimension of Parallelogram a=2.267+- 0.002 cm b=3.376+-0.001 cm and c=0.207+-0.001 cm dose that means that we used equipment to calculat a and another to calculate b and c ? because i know that delta a or b or c is half...

I' m interested in experimental particle physics (graduate level). All books I know are focused on theory, do you know any book which focus on experiment? tnx

In the experimental sticky it says "They flew atomic clocks on commercial airliners around the world in both directions, and compared the time elapsed on the airborne clocks with the time elapsed on an earthbound clock (USNO). Their eastbound clock lost 59 ns on the USNO clock; their...

I'm looking for a way to compare experimental and theoretical data and determining if it obeys a certain law. In particular, I'm writing a computer program that does this and at the moment what I'm doing is, I'm calculating the ratio of each reading with the theoretical result and calculating...

What factors may cause the experimental value of acceleration due to gravity to be different from tha accepted value in a free fall experiment? Will it be something like air resistance , human error , instruments error or wrong calibration ??

I am aware that there is strong evidence for the presence of quarks inside of protons and neutrons through the analysis of deep inelastic scattering experiments. The questions I have specifically relate to the data which supports the composition of the neutron versus the proton, how we have...

I am doing a Lab report on "Using Properties To Identify Pure Substances" I want to know what does the Experimental design mean. Can anyone tell me what it means? Thanks,

Hi, if say you are determining the speed of sound and you want to compare your values to the theoretical value, would you predict that your experiment values will be higher or lower than the theoretical value and why?

Hi, if say you are determining the speed of sound and you want to compare your values to the theoretical value, would you predict that your experiment values will be higher or lower than the theoretical value and why?

Could you please help me find experimental error in bottle rocket experiment that could have affected my results. The experiment is where a bottle gets filled with water, a third of their volume and then they get pressurized to fly in the air. So could you please find me experimental errors...

Hi everyone, I'm currently doing a joint Pure Maths/Maths Physics degree (I did Experimental Physics in first year of college), but am thinking I may have made the wrong choice. If I go on and finish it, what are my options for getting into Experimental Physics? Would I have to go back and do...

Hey guys! Was wondering if someone could help me out. I'm doing a thermodynamics topic and have an issue explaining the following : I conducted and experimental procedure involving a boiler apparatus. (Similar to this one >> http://www.armfield.co.uk/th3_datasheet.html" ) Now the idea was to...

I have two values: r = 12.3 ± 0.2m d = 0.57 ± 0.03mm I want to divide the two values to find theta (d/r = theta), how do I go about this? I assume that I add the experimental error margins together after the division of 12.3 and 0.57? Giving me: 4.63 x 10^-5 ± 2.0003m

Homework Statement I need a method for my experimental lab procedure that allows me to use the same force multiple times. I need to provide a constant force to object A that causes it to collide with object B -- on a horizontal plane. I thought of using a spring on object A where F=kx but...

Can anyone suggest the absolute easiest home-made method to determine grossly the value of G in a Cavendish like experiment?

Hi everyone, I am comtemplating the PhD which I would like to embark on late 2010. I am having difficulty deciding whether I should take an experimental or theoretical path. Of course I have been speaking to as many relevant people as I can, and reading lots of information. Just...

Hi guys, I don't understand how one would exactly determine a dispersion relation of phonons experimentally. There are two equations, one for momentum and one for energy conservation: \vec{k} - \vec{k^{'}} = \vec{G} + \vec{K} \omega - \omega ^{'} = \omega(K) where...

I am a little confused about the justification behind what we do with things we believe to be poisson distributed. Take for instance, gamma-decay counts from a scintillation detector. Suppose we got 100 counts using a 1 minute integration time. We would then assume that the distribution of...

Hi there! The experiment: I'm counting Gamma and beta rays emitted from gamma and beta cylindrical sources, for counting I'm using a simple GM counter, which has nearly the same cylindrical shape (i mean diameter). As we all know this are electromagnetic emissions, so they distance must...

Homework Statement Data obtained in a photoelectric experiment: Wavelength (nm): 140, 117, 93.3, 70.0 Maximum Kinetic Energy of Photoelectrons (eV): 2.76, 4.50, 7.19, 11.61 From the graph, determine an experimental value for Planck's constant (in joules-seconds). Homework Equations...

Hi, I need your help. From experiments I got data set which I need to analyze. The problem is that my data is not smooth. I tried to fit my data using a polynomial equation, but the fitting was not good enough. I also tried to smooth, spline... but got very different final results. Can anyone...

Homework Statement Computational Fluid Dynamics anyone? :D I know someone out there is a genius? I'm trying to understand some of the differences between Experimental results and a Fluent (CFD) analysis of a NACA 0012 aerofoil. There are 3 Cp/x graphs of my results (plotted with negative down...

Hey, I m obsessed with High Energy Physics and would like to do post-grad in the field. I ve applied to Oxford, Imperial, Edinburgh and Sheffield...and (to my surprise) have been accepted to all four...I m trying to get all the opinion/insights/thoughts possible so if anyone is willing to dish...

I would like to build stuff and conduct experiments but i would also like to take walks in the park think of theories. So how do i choose between these two. Maybe i can become an experimental physicist and then come home and write a bunch of stuff. Can you be both an experimental and theoretical...

I am currently doing experiments with polarizing optics and reflection from metal surfaces. However it's not as simple as it sounds in textbooks, so I was wondering if anyone had experience in these type of experiments. There seems to be a fundamental problem with identifying the transmission...

Which one is more favorable: theoretical physics, or experimental physics? In my opinion, theoretical physics is much better, because it leaves one to ponder the how the world works without having to do the all of the things that an conducting an experiment reuquires.