Experiment Definition and 1000 Threads

Compton hit the electrons in a carbon target with x-rays and measured the changes in the wavelengths of the scattered photons versus their deflected angle. He correlated that with the energy and momentum the incident photon gave to the electron. My question is why does this not happen in...

Hi, I have a thought experiment which seems inconsistent with the 2nd Law of Thermodynamics, so there is probably a flaw in the idea somewhere. Imagine a single molecule of a heavy gas (such as SF6) in a pipe 2.5 metres high and 100mm diametre. The pipe is upright and under the normal...

I am puzzled over einstein's thought experiment on simultaneity. In this experiment, a man is standing on a train platform. A woman is sitted in the middle of a moving train traveling towards the man. When the train is half past the man, lightning strikes at the same instant at both ends of...

Hi, I am looking for a video helping intuition on pressure, in the context of kinetic theory of gases. I remember seeing a video where someone poured a bucketful of little hard balls (lead sinkers for fishing?) onto an electronic scales (a dynamometer, really) showing that this corresponds to...

some years ago it was big news when some aerogel bulk launched at the tail of a comet and bits of the comet dust got stuck in the gel. this was going to be recovered somehow and analysed. I do not know any more about that particular experiment but it died out of the mainstream news. anyone...

Hello everyone, I am not a physicist but I have been studying this subject. I came across an article and I'm having trouble understanding. I would appreciate if you could help me. https://arxiv.org/pdf/1103.0117v2.pdf Thanks.

Not sure where the best place to post this is, but here it goes. Imagine you were sent back in time, far enough back when a lot of the now known scientific laws, rules equations etc, haven't been discovered yet. You're someone who is intelligible with many scientific fields, and you have...

Hey, I was watching this video About the quantum eraser experiment (I suggest you watch too, so we would be speaking in the same terms). As I understand it, The experiment goes such that: first the photon enters through the slits as a superposition, then the photon gets measured to gain...

The RAVE project site: https://www.rave-survey.org/project/ In the above image taken from one of the RAVE DR5 video, surveyed stars are shown in 3D and color coded according to their positive or negative radial velocity relative to the Sun. I'm a bit puzzled that stars on one 'side' tend to...

My setup: plastic box (~1l) with the cover painted black mat the bottom of the box covered with sponges saturated with ethyl alcohol (90%) to the limit (all over sponge capacity poured back to bottle) turned upside down and placed on ~0.5kg of dry ice. I can see a 'rain' of particles of...

What is the desired outcome and why in space? http://gbtimes.com/china/china-launches-worlds-first-quantum-science-satellite-jiuquan

I have had many people claim that QM has never made a prediction that has been contradicted by experiment. Yet as i understand it Qm predicts the vacuum energy density is 10^122 erg per cubic cm whereas the measured energy density of 10^-8 erg per cubic cm. So how is that not an example of an...

Homework Statement [/B] Hi everyone, some school mates sugested id try this forum for help with this work i have :) - will try to keep it short We were trying to induce current in a coil and confirm the experimental results with math, but the math is way off and nobody is sure...

Stark effect (shifting and splitting spectral lines due to external electric field) is calculated in nearly all QM textbooks as application of perturbation theory (alongside Zeeman). Wikipedia article ( https://en.wikipedia.org/wiki/Stark_effect ) has a nice figure with n-th level splitting into...

To get this out of the way: I know how a kundt's tube generally works and how you can use it to determine the speed of sound. For anyone who hasn't heard of it, you take a tube and "feed" it a resonant frequency.(very similar to a rubens tube) The nodes of the resulting standing wave in the...

Homework Statement We recently conducted a physics lab in class where we designed an experiment to "prove" the kinematic equations. We used photogates, ramp and a car. Homework Equations We have to show v = u+at and the other kinematic equations are true with our collected data. The Attempt...

I watched a documentary by Brian Greene, "The Illusion of Time" a few weeks ago, and a question has been bothering me ever since. In the documentary he explains that an alien, traveling toward the earth, would see into our future. So here is my question. The second half of a college football...

Hi guys! For a school experiment we are supposed to connect a 9v battery to a 180 ohm resistor and multimeter and calculate how long it take to die at different temperatures . does anyone know how can i do this using a formula? I will need it in my report. Thanks for the help! :)

I would like to show you my own opinion about DSE. I might be silly but I suspect data filtering issue. Let's suppose we have a detector DA for slit A, DB for slit B and a interference detector D0. If we consider the photon a wave pulse it means it will go either through a slit or through both...

Hi In the FH experiment, what is physically happening when the excited mercury atom hits the metal plate? why does it induce a current drop? Thank you for any help :)

You have a glass (or plastic) dish (like a small transparent dish). You shine light onto its flat surface. Your lab partner discovers that 55% of the light has been transmitted, 55% is reflected. What is the absorbance of the dish (not in the log scale, just as a regular %age)? State a...

Homework Statement The distance between the 1st bright fringe and the 21st bright fringe in a Young's double-slit arrangement was found to be 2.7 mm. The slit separation was 1.0 mm and the distance from the slits to the plane of the fringes was 25 cm. What was the wavelength of the light...

In the Stern-Gerlach experiment , they used silver ions with a an unpaired electron in the outer shell...The typical result from passing the silver ions through a Non-uniform magnetic field is to separate spatially the bean into two types of "spin"...In other words the non-uniform B filed cause...

Apologies if the question has been asked, I didn't see it in my search but maybe I missed it. I was wondering if there is a formal definition of when/where a quantum experiment begins (as opposed to where it ends, i.e. with the collapse of the wave function), and whether it matters. For...

Hi, i came across this video on BBC yesterday: <link to video deleted> Now I wonder how this stuff works in detail? Is it the carrier wave or the multiplexer signal of the phone? best regards

I successfully created the fringe pattern at home with a simple laser light and a black plastic sheet with two thin cut as double-slits. I then used two mobile phone cameras at two sides in hope that the wave function of light will be collapsed. But nothing happened i.e. the fringe remained...

Experimental test of nonlocal causality http://advances.sciencemag.org/content/2/8/e1600162 Quantum mechanics trumps nonlocal causality http://physicsworld.com/cws/article/news/2016/aug/18/quantum-mechanics-trumps-nonlocal-causality Having just read the full paper it seems to that it doesn't...

I set up two canister vacuum cleaners facing each other: I had the idea that if there was some circulation in the air (provided by the small fan) then a vortex would form between the inlets. This does not seem to work. I don't have much knowledge or intuition about aerodynamics. Would this...

What if our quantum eraser was a black hole? There's talk of event horizons preserving all the information that crosses them? Could we test this hypothesis by seeing whether or not black holes make good quantum erasers? Depending on the distance to the black hole - it might be hundreds...

I am completely unschooled here, so go a bit easy, if you would. My question(s) involves the actual mechanics of the T2K neutrino/antineutrino experiment that was written up here on Aug. 8. I have a hard time understanding the process described here: "To explore the (anti)neutrino flavour...

By measuring the speed of the light beams through the inferometer michelson morley tried to explain the existence of ether. This was done by measuring light beams's speed. The beams were in different direction. Did they want to say that the beam in the direction of the movement of the Earth...

regarding Young's two slit experiment 1. HOW can a light source is used to create a single photon that can be directed at 2 slits simultaneously ? I am confused as to how the light source can be aligned with both of the slits simultaneously. IF the light beam is wider than the distance...

It seems that this was published last year on IJQF http://www.ijqf.org/wps/wp-content/uploads/2015/12/TooLate.pdf "In the EPR experiment, each measurement addresses the question “What spin value has this particle along this orientation? We propose a new setting where the question is...

I am not a physicist but I was curious if there was any information on the following thought experiment. Say a beam of light emitted from a far away star passed a black hole at just the right direction that it became entrapped in a sort of orbit like the moon around the earth. Is this possible...

Hi. I was browsing Wikipedia on a topic, went to magnetic bearings, etc etc...ended up on synchrotron radiation then the phrase about how a moving or accelerat/ing/ed particle passing through a magnetic field generates electromagnetic radiation. Then I has a revelation. How to get a particle...

Hi, can someone explain me the next experiment: If I have an AC coil on iron stick, and if I put Cu ring on that stick concentric with AC coil, when I turn coil power supply, the ring will levitate on some height. My question is: Powered AC coil produces an AC magnetic field. If I put a...

Homework Statement Hi, I want to apologize for any grammar errors in advance since english is not my first language. But i hope it is good enough such that the question is clear: I want to calculate the velocity of a Helium-atom after it scattered on a double slit. The following information are...

Hello PF! I am about to conduct a physics experiment to write my high school level paper on. I initially was going to investigate the Gaussian Gun, but my physics teacher has said that I need to have real life, practical applications of the model, and to also have a variable I can change and...

Is it possible that the reason the delayed choice two slit experiment outcomes occur is because for the photon, traveling at the speed of light, the past, present and future are all as one, and therefore it "knows" what is going to happen and therefore always "makes the right choice" at the...

Let's say here are two ways for a photon to go between point A and B and a detector at B detects photons with some probability based on interference. Mathematically, it's calculated by carrying phases along each path and then adding them up regardless of how much time it takes to travel along...

What is detected on the second screen if after a photon went through the slits but before it hits the second screen, the screen with slits is removed (or both slits are closed)?

Hi I have some questions and ideas regarding Bohr's double slit experiment which he extended with a Camera as an illustration of delayed choice. I read about it 40 years ago but can't find a reference to it, I'm hoping it wasn't apocryphal but it's consistent with Q-phys as I know it. The...

Now I was just reading about the 'double slit' experiment. So photons or electrons, atoms or other sub-atomic particles pasting through a double slit exhibit superposition. Ok got that, I hope, now if there are two double silts behind the first then four behind those two second ones and so on...

I heard about the following experiment and I'd like to know if it really works this way: Double slit experiment with a detector that gathers information about which slit every particle goes through and stores it in an unobserved black box. The screen is an unobserved photo film that needs to be...

widely reported in all science channels LUX Dark Matter Experiment Ends With No WIMPs Found what are the ramifications to SUSY QG string theory LQG MSSM dark matter etc based on this results? how likely is dark matter WIMP hypothesis in light of this null result, and of neutralinos Does this...

Is one particle detected on the detection screen for each particle shot in a double slit experiment? Or do some particles fail to be detected because they hit the barrier in between the two slits? In other words, is there an exact one to one correspondence of particles shot to particles...

I am a high school student experimenting with the Verdet constant of materials and how it affects the polarization of light in magneto-rotation. I have trouble acquiring the proper materials for this experiment. Here is what I have so far: -AC/DC Power Supply -Gaussmeter -Optical laser under...

Hi. I'm wondering how different potentials, such as the Dirac-Delta potential, linear potential, quandratic potenial, etc., are implemented experimentally. I only understand how the Schrodinger equation is solved if these are the potentials and I'd like to have a better understanding of quantum...

Hi, I studied undergrad pure maths now post grad philosophy, not quantum physics, but please consider the following experiment: Suppose you set up a double slits experiment with a photon detector attached to each slit, and the photon detector attached to a photon transmitter, so the photon can...

I'm not sure why schrodinger proposed his cat in a box experiment. Can anyone say why?