Experiment Definition and 1000 Threads

Homework Statement Given Ampere's Law and Faraday's Law (in differential or integral form fwiw) explain why it is easier to design an experiment to show that a changing magnetic field creates an electric field than it is to show a changing electric field creates a magnetic field. Justify your...

Hi I wonder if anyone can tell me what was the source of light Michelson and Morley used when they did the experiment(s) to measure the (difference of) speed of light in different directions? And can it be done with sunlight? Young observed interference patterns with sunlight in 1801 in...

Hi everyone. I heard that there are several theories or hypotheses to quantize gravity such as superstring theory, loop quantum gravity, etc., and I believe none of them are conclusive (that's what I heard). So, here is my question. 1) Is it because there are no experimental results which prove...

I read that they found gravity waves that have the frequency of 35 to 250 hz but are not these frequencies that of sound waves? I thought sound does not propagate in vacuum or is there a new kind of gravity vacuum that contains a gravity ether or dark matter?

I'm currently completing an Atwood Machine Experiment with two 100g weights on either side of the pulley, with a variance in weight created by attaching dimes and pennies to either side of the weights. The point of the experiment is to validate: (m1 – m2)g = (m1 + m2 + I/R2) Homework Statement...

Hello all, I was thinking about the speed of light and why it's constant and it brought me to the principle of the LIGO experiment for which I have an assumption that I want to verify. I'm a novice at this so please bear with me. From what I know, the LIGO experiment splits an emitting light...

why ether medium fail in michelson morley experiment?

Hi, just came across a video on CNN showing how to make water behave like it would in space: <link to video deleted> My question about that video is: what height do i need to get a free fall time of 10 sec? best regards

Hello! I am new to this forum so I don't know if I am posting this under the right part. Anyway, I am an undergrad and my phys 101 mechanics course requires to come up with an experiment related to the course content, write a report on it and present it to TAs. I decided on a simple pendulum...

Refer to this image: http://imgur.com/xT20HOv The white nodes are 'stations' which broadcast signals at light speed. The blue circles around them represent the particle horizon relative to these nodes. The pink nodes are intermediary stations in between these stations that pass on the signal...

Unlike Ohmic resistors the resistance of a semiconductor decreases with temperature...or not. Can a fragment chipped off a diode or some random IC be used to measure this with a multi meter??

In the train-embankment thought experiment described by Einstein in his "public" version of STR, he says the following: “Hence the observer will see the beam of light emitted from B [the front of the train] earlier than he will see that emitted from A [the rear of the train]. Observers who take...

What happens when an innocent AI chatbot meets Twitter? NSFW language. http://www.telegraph.co.uk/technology/2016/03/24/microsofts-teen-girl-ai-turns-into-a-hitler-loving-sex-robot-wit/

Let us first review Einstein’s train and platform thought experiment which consists of one observer midway inside a speeding train car and another observer standing on a platform as the train moves past. A flash of light is given off at the center of the train car just as the two observers pass...

Has there ever been an experiment to support the principle assumption of relativity? For example an experiment where an atomic clock is sent on a probe to , let's say, Pluto. We on Earth get transmissions of the time on that ship and, after taking account of the light travel time delay, we...

In 2011 Dr. Gerald Guralnik of Brown University was involved in an ongoing Dark Matter Detection experiment, perhaps LUX? It was an international collaboration involving underground detectors. He was certain DM would be detected in 5 years - i.e., now. I was dubious, so we bet "bragging rights"...

I conducted an experiment to find out the emf of a battery, the result turned out to be 1.35 volts , however on the battery, it says the battery is 1.5 voltage. Does it mean that my method is wrong or less accurate. But I used three different methods:1) measuring the terminal voltage across...

Hi there, I'm a junior in undergrad, and so far I've had a summer of research experience at an REU, just started research at my current school in December, and am doing another REU this summer. I'm a transfer student and at my previous school there were literally no research opportunities...

I am a degree student and .. A loner. During my free time, I usually try to observe my surrounding more, you know... :\ Here's the experiment I did (I saved it in my note app, copied it directly from there): A certain window has a point of view (not referring to the meaning where point of view...

Hi, I am mike from australia, I am new to the forums and am having trouble answering the question below, I have included some information on the experiment as well. You are given a water bottle with a pin sized hole in the bottom, and a line drawn around the bottle at the level that 50cm3 of...

If we take a look at the experiment were two observers A (inside a train) and B on the platform observering the train as it pass by. Person A will stand in the exact middle of the train and send out a light wave. Person A will observe the light to hit the wall at the same time, while person two...

Homework Statement My group and i need to do an experiment for school. We decided to investigate the effect of water level in a vine glass (or volume) on the resonance frequency. Basically does the resonance frequency change when you change add water to the glass. I would just like some help...

The subject of relativity has been haunting me for while now. Everytime i feel i understand a concept, there comes questions withtin that contradict the undestanding. Have been trying to digest the time dilation & symmetry of how it is felt mutually by observers in two different frame of...

From my shallow understanding, when we shoot a small amount of electrons through the slits while observing, the observation interfere with the electrons and the quantum system and thus collapse the wave function, making the electrons behave like a particle and form a 2-slit pattern on the...

Homework Statement When Millikan first performed this experiment, he used water droplets instead of oil. He found he could not suspend the droplets; they would start to move up. Why did this happen? Homework Equations N/A The Attempt at a Solution The water droplets would have been so small...

Hi all, I was just wondering how I could recreate this at home What parts do I need? Thanks, Harry

Its been a while that I'm thinking in what sense we can say the SG experiment is a measurement. What I concluded, is that there are two kinds of measurements. 1) Measurements that advocates of the ensemble interpretation (like our own @vanhees71) declare as the only one that QM has anything to...

Hello. I want to share a thought experiment that could tell Quantum Mechanics apart from Pilot-Wave interpretation. It goes like this: Quantum Mechanics vs. Pilot-Wave: Quantum Mechanics: Waves collapse to particles. Waves disappear when particles are detected. Pilot-Wave: Waves are real but...

If I understand the delayed choice quantum eraser experiment correctly, it's essentially set up in the manner as the double slit. The only difference is that the detectors are set up in front of the double slits. It was thought that if there was an interference pattern that appeared then that...

I'd like to ask what exactly do the results of double slit experiment mean? I must confess that I've read about this mainly in New Age literature where it was used as a "proof" that our consciousness changes reality. I know that Physicists probably don't like such explanations :eek: So I'd like...

I'd like to understand the details behind the LIGO experiment a bit better: How do scientists know that the gravitational waves detected by LIGO originated from two specific black holes (located a billion light years away)?Does the LIGO result confirm the existence of black holes?Was it only...

Hello there everybody In my research group we've been working on PV cells and exploring non-conventional techniques to try and raise the efficiency of some of the lesser explored materials that have PV potential. Well, last week while testing one of our cells in a solar simulator, we noticed...

When the slits are made narrower (but with same separation) why are more fringes produced? If the slits are narrower, less light enters, so less light interferes with each other, so lesser number of fringes should be produced, isn't it?

If you have a classical antenna absorbing an electromagnetic wave, the charged particles inside the antenna will be given momentum in the directions perpendicular to the direction of propagation of the EM wave (because the E and B fields are perpendicular to propagation). If just a single...

I have a piece of wood, I decide to insert it into a steamer to observe what happens, because I'm not sure. There could be multiple possibilities. Wood has conductive tissue, steam may get trapped within pressing it outwards. The temperature dependent expansion definitely happens. But steam not...

If I try to send a vertically polarized photon through one slit and a horizontally polarized photon through the other slit, they actually go through both slits. But when I measure and find out through which slit the horizontally polarized photon went, I automatically know that the vertically...

I need an idea of what to test if I were to do a physics experiment about snowboarding. It can be one involving someone riding a snowboard or an empty snowboard. However, I would like it to be relatively simple, as in my rider doesn't have the skills to ride a half pipe or do any big jumps. I...

Not sure where this particular question belongs. Do you know of any Cavendish type measurements of G, in which the mass (and ~density) of the attractors (gravitational sources) are controls, and the number of particles (fermions or maybe quarks+leptons) is the independent variable? The...

Hiya, Another me trying to grasp some physical experiment. I'm working myself through a Dutch popular science book "Snaartheorie" (String Theory) by 'our' professor Marcel Vonk: it's meant to give the reader a maths-less impression of the theories behind string theory. Vonk starts with an...

Might I be so bold as to ask a question about the "double slit experiment". Was wondering...have scientist ever considered...turning the observation on and off...? Is it even possible...? Experiment says...when observed...particles react one way...and when not observed...they react a different...

can anyone please explain to me why it's not possible to determine accurately the position of a centre of a Newton's ring pattern? I know that in a Newton's ring only the distance between one side of the ring to the other i.e. the diameter can be accurately determined, not the distance from the...

Normally in explaining the aether model of light it is said that all waves need a medium, so just like sound uses air, light uses the aether. To my understanding sound can travel through gas, liquid and solids just fine without air being partially entrained in the materials. Sound does not use...

In "Einstein's Moon" by F. David Peat there is a description of the EPR thought experiment,but I am confused by Bohr's response to Einstein given in Peat's book. In the EPR as described by Peat, particle A and particle B move in opposite directions after the entangled particle (AB)...

Inspired by stevendaryl's description of an EPR-like setting that doesn't refer to a particle concept, I want to discuss in this thread a generalized form of his setting that features a class of long-distance correlation experiments but abstracts from all distracting elements of reality and from...

Homework Statement For a question in a worksheet (the actual question is irrelevant), my physics teacher said, in the context of the Young double slit experiment with light, if you make one of the slits smaller, then the amplitude of light from that source will also decrease. Is that true...

I'm going to perform a small scale electrolysis experimenter of water. I want to find out how the rates of the gases are produced when the amount of electrolyte added to the water is changed. I'm going to use baking soda (NaHCO3) as the electrolyte but I just wanted to make sure that I won't be...

Hello pf Is the effective mass dependend on the donator atom in a semiconductor? In our experiment we have calculated the effective mass in a germanium semiconductor, doped with an unknown atom. It is 0.39m_e. From the internet we know that the effective mass is 0.33m_e. Is our result...

Homework Statement [/B] A student wants to find the refractive index of a rectangular block of glass. He draws around the block and marks the position of a ray of light that travels through the block. With the block removed, the student can draw in a normal line and then measure the angle of...

What would have happened to to the evolutionary process had the Earth's axis of rotation had no tilt? What comes to me first would be a total lack of anything based on the year calendar. There would be no deciduous trees or dormant grasses, certain animal species would have no particular mating...

Why do the silver atoms not exist in a superposition of states with every possible mixture of spin-up and spin-down? Thermal photons do.