Experimental Definition and 494 Threads

how does one experimentally check biot-savart's law

A simple question of a curious person: How well is the general relativity verified experimentaly? In particular, are most of the tests conserned merely with the linear approximation of the gravitation? Or is there more or less direct evidence for the validity of strong gravitation fields, or...

New member ! This is my first post. Long ago, I remember one of my friends talking about how engineers dream of becoming experimental physicists who in turn dream of becoming theoretical physicists. I remember the context but don't remember whether it was an explicit joke or musings of some...

I would like to compile direct and indirect data on the speed of light in the universe.o:) How much evidence do we have that it is constant, even close to a black hole? What kind of observations could be relevant to answer such a question? Thanks for your comments, links and references...

Dear PF, Could you please advise me where I can find the up to date experimental value of Bohr magneton with its uncertainty? Thanks a lot

Hi, I'm currently doing a research study on the effect of the presence of a rear car spoiler on the lift of a vehicle at low speeds As far as my understanding, with an increase in air velocity, there should be an increase in lift on the car. My trials however show that with an increase in air...

Goodmorning, I would be interrested in experimental data regarding the Bremsstrahlung process near the quantum mechanical cutoff, possibly single events data. I thought that maybe something like a bubble chamber picture could illustrate this process. This is maybe a naïve dream but this...

What are the perks and cons to being an experimental or theoretical physicist? and Is it possible to work on both areas? Thanks in advance Charonic

Hi, I have a question about the transfer of electrical charge from object to another. Basically, my professor stated that if you rub a rod with certain matierials, the rod will become charged. This is due to the convention that Ben Franklin came up with called the triboelectric series. So...

I was wonder what you felt the important experimental discoveries in high energy physics over the past twenty five years have been? This is a subject I'm not familiar with and would like to do a bit of reading on my own. For instance, I imagine the possible mass of the neutrino would be on...

Is there any experimental evidence that confirms or points toward extra spatial dimensions? I have been looking around for a bit, couldn't find anything.

We did an experiment with abysmal accuracy. I'm now writing up my report and would like to meaningfully express the error between calculated and measured values. EXAMPLE calculated T=0.284 measured T = 0.201 I want to express the difference between them as follows: % difference...

here's the link http://www.newscientist.com/channel/fundamentals/mg19125675.100-atomic-jitters-hint-at-quantum-spume.htmlin a nut shell 1- pollen in water jiggles - other small particles also jitter in solution. 2- einstein explained this as brownian motion & atoms 3- Einstein did not directly...

Has there been any direct or indirect evidence from particle accelerators, telescopes, or observatories that the universe has more than 3 spatial dimensions? If not, what kind of evidence or data are particle physicists looking for? Are there some unexplained phenomenon that could only be...

Hi Im new in this Forum. I am from Switzerland, in the first year of Physics at University. Please forgive some mistakes I might will make in english I read a little bit in advance for the next years about the SRT and its relation to other fields of study. Basically I wanted to know...

Don't miss this paper from the Zeilinger group: R. Kaltenbaek et al, PRL 96, 240502 (2006). In particular, read the first paragraph: Zz.

After reading one of ZapperZ's posts in the Relativity subforum, I just thought I'd ask the following: What predictions of QED, QCD, Electroweak and the Standard Model still aren't confirmed? I'd be particularly interested in hearing unconfirmed predictions from QED.

Hi everyone, Maybe this resource is new for someone. It's a collection of videos made in the 60's by the very best experimentalist scientists of the best universities of the United States. There you may watch how Taylor gives you a lesson in Low Reynolds Flow, how Lighthill gives a lesson in...

hi all im doing a lab on the atwoods machine basically i ahve calulated gravity as eqaul to 7.09 m/s^2 so i am way off because tis really 9.81. its because of human error when i was using the stop watch. i can't rember the formula for figuring out the perecentage of error even tho its really...

The perihilion of Mercury and the eclipse of 1919 (Eddington expedition) are given as the first experimental verifications of General relativity. However, feeling pedantic, I was curious just which one these is accepted as the vital first prediction of GR in agreement with the real world? If...

Hello all. I am trying to work through my problem sheets and I need some help from you guys.. I am trying to find out experimental methods to measure the size of the nuclei.. Thx so much K

An experimantal study is possible provided that; 1) nature is invariant under space-time translations. (so that it is possible to reproduce the results) 2) nature is invariant under Lorentz's group. (and this establishes a possible causal connection between parts of experimental...

This is my report on an experiment that I have done and I really needed the latex codes to generate the equations. I have done the other parts of the report on other PC. Do they seem to be ok? (the errors, like the max possible value and min possible value) no help is really needed, rather...

Due NO LATER THAN October 1 Write an experimental design based on any graph from the textbook. You may make slight alterations to the graph. Include all pertinent parts to a good design. On a separate sheet of paper, identify the following from your design: observations, hypothesis...

Hi, I went to my proff to ask for my master thesis, he told me that you yourself have to do the experimental set-up for EMISSION AND REFLECTION SPECTROSCOPY ,,,but I am not that experienxed, anybody knows is it an easy task or...?

Have there been any experiments designed to explicitly test the projection postulate? I mean that part of it that says the measured particle is left in an eigenstate of the measured operator. The usual devices for measuring particles (photomultipliers, phosphor screens, etc.) don't really...

I have a graph which shows the rate of cooling of a tent from about 35 deg C to 15 deg C, it looks like this: http://students.bath.ac.uk/en0jma/graph.gif How do I work out the convective heat transfer coefficient of the tent from this data? Thanks for any help

I might not have carried out my experiment very rigorously using a toy gyroscope that lasts 7 minutes. But in 20 measures the two top lasting winds were the ones that had precession and the rest were showing equal lasting with variations of 30 seconds usually

So what exactly are the big differences between the two? Who 'contributes' more to science? All but 1 of the active professors at my university are theorists and they keep kinda tryen to nudge me into being a theorist without really knowing what either group does. Help me, i need career guidance :D

Hi, I'm taking a course (lab) in which I'm required to think of an experiment, design and build it, forecast its outcome, conduct it, and analyze the results. Sadly I'm having a hard time thinking of any worthy ideas for such a project... The experiment should be on the subject of...

Testing Solubility the following results were obtained: Tested in Water: Methanol: Soluble Ethanol: Soluble Diethyl Ether: non-soluble Cyclohexanol: soluble Acetone: soluble 2-butanone: soluble Cyclohexanone: soluble Tested in Cyclohexane: Methanol: non-soluble Ethanol...

I know there have been some frame dragging effect experiments, with the GPB being performed at the moment. Which other experiments are planned/ or have been performed that may show strong evidence for the theory of GR? any experiments at all will be appreciated...whether they show evidence...

Can I make conducting paper/carbonized paper on my own for use in in an undergrad EM lab? Are there alternatives for experiments that help learn field mapping? How can I rig up and electrolytic tank that may serve my purpose?

Is there a reason why our observed reality is actualized and isormorphically the same within a set context? After all humans behave like humans and dogs like dogs and things like there like.

Will there ever be any form of experimental proof of multiple dimensions, even any thought experiment which would be able to proof or disprove the existence of one?

are there any experiments to prove length contraction and time dilation? are time dilation and length dilation inter dependent? how can we say thaT THE LENGTH ALONG THE Y-AXIS DOES NOT CONTRACT and from which side of the length contraction actually happens?

Can anyone provide a good reference (preferably on-line), or a decent description, of how the fundamental constants of electromagnetism are experimentally determined? I'm talking about constants like the permitivity and permeability of free space. I'm also curious how the unit of charge...

I would like to create (with everyone's help) a list of experiments etc that support SR and GR. These should be reproducable experiments, or profound predictions that have been upheld, as well as objects/systems that use SR/GR calculations on an everyday basis. I would predict that such a...

Experimental Quantum Transition Physics:A Necessary Heretical Postulate. :cool: There are some simple, if not heretical, postulates of physics either unknown to, avoided or ignored by the vast host of those using Quantum Theory in their theorizing. The following is simple in concept, far...

I was given a small steel ball and asked to find its density. To do this we weighed the ball and measured its diameter. Its weight was found to be 16.1 grams (.0161Kg) with the scales having an accuracy of +- .1g (.0001Kg) To measure the diameter we had to use a ruler. It was decided that...

Monitoring the height a ball gains in an air jet. Using Ping-Pong Balls and I'd like to keep the air jet velocity (20ms) while varying the mass of the ball. The ball is currently 2g, I'm looking to add another gram to this figure. I thought about paint, does anybody have any other...

Hi All, Probably some of you have seen papers relating Woodward research of the origin of Gravity and Mach's principle. Anybody knows what became of all that?The proposed experiment isn't extra difficult for conducting today ,but as far as I know he (Wooodward) had problems with sensitive...

which physicist is better in knowledge, earning and prestige.

Can someone inform me a bit on the background of this problem, it's experimental testing and it's implications? If I have it right, it involves two particles which are involved in a singular event. If you measure the momentum of the first particle, you not only create uncertainty in it's...