What is Experiment: Definition and 1000 Discussions
An experiment is a procedure carried out to support or refute a hypothesis. Experiments provide insight into cause-and-effect by demonstrating what outcome occurs when a particular factor is manipulated. Experiments vary greatly in goal and scale, but always rely on repeatable procedure and logical analysis of the results. There also exists natural experimental studies.
A child may carry out basic experiments to understand how things fall to the ground, while teams of scientists may take years of systematic investigation to advance their understanding of a phenomenon. Experiments and other types of hands-on activities are very important to student learning in the science classroom. Experiments can raise test scores and help a student become more engaged and interested in the material they are learning, especially when used over time. Experiments can vary from personal and informal natural comparisons (e.g. tasting a range of chocolates to find a favorite), to highly controlled (e.g. tests requiring complex apparatus overseen by many scientists that hope to discover information about subatomic particles). Uses of experiments vary considerably between the natural and human sciences.
Experiments typically include controls, which are designed to minimize the effects of variables other than the single independent variable. This increases the reliability of the results, often through a comparison between control measurements and the other measurements. Scientific controls are a part of the scientific method. Ideally, all variables in an experiment are controlled (accounted for by the control measurements) and none are uncontrolled. In such an experiment, if all controls work as expected, it is possible to conclude that the experiment works as intended, and that results are due to the effect of the tested variables.
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Question:
An experiment is proposed to directly measure the width (Γ) and mass (m_H) of the Higgs boson via the reaction: muon+ + muon- > H.
Sketch a graph of the expected cross section as a...
hi
are the path lengths to the slits strictly equal?
If the difference of the path lengths is progressively increased, how evolve the fringes visibility?
Hello all!
Inspired by the Helmholtz synthesizer, I am experimenting with electromagnetic excitation and tuning forks.
http://www.sites.hps.cam.ac.uk/whipple/explore/acoustics/hermanvonhelmholtz/helmholtzssynthesizer/
How can I determine the size and charge of an electromagnet in order to...
Trying to create an experiment that utilizes a motor driven shaft to measure the angular velocity of another shaft via eddy currents. We made a mock experiment that uses 8mm shafts, pillow bearings, and ceramic magnets from home depot, but don't see a torque on a non-ferrous metal attached to a...
Homework Statement
If a green laser is (wavelength = 532nm) sent through two slits with a separation of 127 um, how wide (in total) would the 11 green dots formed be if they were projected onto a screen 1.25m away from the slits?
Refer to this diagram sorry for bad quality...
Hi,
Joule's original gas expansion experiment is often presented like in the following link:
http://demonstrations.wolfram.com/JouleExperimentOnFreeExpansion/
The apparent lack of temperature change in this experiment is often used in textbooks to demonstrate that the energy of an ideal gas is...
Hello, I have a question. In Feynman lectures vol. I, in chapter 37-2, Feynman has an experiment with bullets.
*Copyright http://www.feynmanlectures.caltech.edu/III_01.html
But the curve for ##P_{12}## looks in the picture is different from his live recorded lectures.
*YouTube -
Is the...
In 1851 Fizeau made a famous experiment which corroborated de Fresnel's drag coefficient of the luminiferous ether. In the experiment two light beams traveled through a tube of moving water (at 7cm per second), one moving against the water flow (let's called it beam A), and one for the water...
So I've stumbled upon a really cool opportunity this summer, where I basically have a hospital which has agreed to let me do an experiment using their 3T MRI machine. I'm a physics undergrad and I want to do a physics experiment using the MRI, but I have absolutely no idea what to do. I've tried...
Hi all,
I performed a resonance experiment over the past two weeks, in which I collected the intensity of a Fabry-Perot cavity whilst adjusting the mirror distance with a piezo-element (the specific setup of the experiment is fairly detached from the question I will ask). My raw data is...
I n ordinary weighing scale, in left pan, there is spiral shaped coil (like that mosquito coil) or any long shaped rod. Middle point of this coil is touching the left pan. Let mass of this coil be W1. Second body of mass W2 is attached to other end of this coil. So the left pan is experiencing...
One sometimes gets excited about something and loses sight of essential details, which when taken into account derail the attempt. If in this case that happens, I beg you to let me know. Is the next.
Think of the mutual collision of a particle and its antiparticle. Before the collision there...
Hello!
In this webpage:
https://onlinecourses.science.psu.edu/stat503/node/35
it describes the 2^k factorial experiment design. I understand that k is the number of factors that we are investigating (in this case two, a and b), 2 are the levels of each factor (+/-) and 2^k=4 is the number of...
https://photos-5.dropbox.com/t/2/AAC1PAsxThHE7dTxxumANssxIDSrZGA0wi9u1T2alieA9g/12/217355121/png/32x32/1/_/1/2/Screen%20Shot%202018-04-24%20at%2014.40.53.png/EJ6fyaMBGOQEIAIoAg/zVJasOZ8quUZpWc6eN6tzuO7YSmC-VjpQ4ikXIkpC8A?preserve_transparency=1&size=2048x1536&size_mode=3
So in looking at the...
I don’t understand why do we use power in this experiment. If we use powder, the d spacings of each crystalline will be oriented randomly, why won’t the angle of reflection changes? I don’t understand the idea of using powder in the experiment.
Thank you so much
Greetings. My name is Antti, I'm from Finland. My scientific background consists mostly if not only from watching youtube videos about science and Googling things that I'm curious about. So i registered on this forum to ask questions from the more educated people.
So here's my understanding as...
Please move this if it belongs to other subforums.
So i thought about some other stuff and then somehow this idea appeared to me, now according to physics it is impossible to communicate information faster than the speed of light through vacuum which is "c".
So for any two bodies moving in...
Sometimes experimental or observational evidence from credible physicists points to new physics and then turns out to be wrong due to statistical flukes, experimental error or a theoretical analysis mistake.
What cases of this happening do you find most notable, what showed that the hints were...
Hello, I have four questions. As it stands now, I don't have the necessary materials to test this myself, which is how I'd prefer to learn the answer. I still plan on doing this experiment for fun once I can acquire the necessary components.
This deals with Lenz's Law. My goal is to maximize...
Homework Statement
Suppose a double-slit experiment is immersed in water (with an index of refraction of 1.33). When in the water, what happens to the interference fringes?
Homework Equations
λ = λ0 / n
y = (λmL) / d
d = distance between slits
L = distance to viewing screen
n = index of...
Hi all
I was wondering what happens if one slit in youngs double slit is bigger than the other?
I recon that the of maxima will rise and in minima, there will be no dark spot, but dim light instead. Is that correct? If not can you please explain what happens?
Thanks
Gravity is weak - while we can study the other interactions with individual particles, for gravity we need macroscopic objects to get measurable forces. This makes it easy to measure quantum effects for the other interactions, but hard to do so with gravity. Gravitational forces are always...
Hello Everyone,
I am reviewing the SG experiment. I think the experiment was set out to demonstrate that the orbital angular momentum ##L## is quantized producing a quantized magnetic momentum. But silver and hydrogen atoms have no net orbital angular momentum. Still two sub-beams, due to two...
Homework Statement
I am currently working on a physics experiment to confirm the parallel axis theorem. To do this, I have the following setup:
In this experiment I change the distance between the centre of the rotating disc and the central axis. I record the time for 5 complete rotations...
Homework Statement
Determine sources of error which could have affected the results.
Some background information: The lab consisted of playing a tone generated by a tone generator above a standing open-closed tube which had water in it. The first harmonic was measured through a computer system...
Homework Statement
I have taken 5 sets of readings of voltage against angle for an experiment to determine specific rotation. (I'm using the maxima to determine the phase shift) So, having averaged these values and determined the maximum, I can then trace back to the angle at which this...
Consider a box whose walls are mirrors. Suppose we trap a bunch (yes, it's vague) of photons inside the box. They will not escape, or assume that a major part of them will not escape the box.
Now suppose we have a way of decreasing the size of the box at our will, but possibly obeying the laws...
What would happen if a youngs double slit experiment is done with different slit sizes? I get the feeling that the intensity might never be zero as the waves might never cancel out completely. Am I right? How should I analyse the Intensity?
Would I have to do something like what is done while...
I have a misunderstanding about the beam splitter in this experiment
High fidelity entanglement swapping with fully independent sources
Rainer Kaltenbaek, Robert Prevedel, Markus Aspelmeyer,Anton Zeilinger
http://arxiv.org/pdf/0809.3991.pdf
Part of the diagram is reproduced here
Two photons...
Homework Statement
I experimented with standing waves on an oscillating string, and I was asked to calculate the absolute error of µ (linear mass per unit length). I don't know how to calculate it, so please help me.
I loaded 100g, 200g and 300g on the string. Below are tabulated data of the...
Homework Statement
So I've spent many hours on here and deep deeeeeep in my textbooks trying to learn things...that pertain to the Egg drop experiment
I am almost done with everything I need but I was wondering. I've read that it takes approximately 25 Newtons of force to break an...
In Principle of equivalence, we indroduce to the theoram by a lift experiment, my question is why the lift is fully closed one, why the observer in lift forbidden to observe out side world
Homework Statement
a) Explain why a pattern of bright and dark fringes visible on a screen when a light is shone through a double slit.
b) Upon using Thomas Young's double-slit experiment to obtain measurements, the following data were obtained. use this data to determine the wavelength of...
1. The problem statement, all variables and given/known da
Homework Equations
Interference minima is asinΘ=nλ/2 where n=1,3,5,7...
[/B]The Attempt at a Solution
Putting ab/(2sqrt(b^2/4+d^2))=λ/2 for first order minima
And solving for d I get (b/2)*sqrt((2a/λ)^2-1) in which only the 2 factor...
Morning mates,
I've peformed Galileo's experiment with inclined planes, using a ramp of 88cm (divided in 4 parts of 22cm), inclined by a height on the right-edge of 4cm. I've measured the following,
1/4 of the ramp (22cm): 1.75s (error of 0.1s)
1/2 of the ramp (44cm): 2.70s (error of 0.1s)
3/4...
Homework Statement
I'm attempting to write a FORTRAN program that calcuates the magnetic field, B, at any point outside of a bar magnet. I will be using a simple first order euler scheme for numerical surface integration. Homework Equations
Here is the exact method I will be using...
In Michelson Morley experiment we use a moving
mirror to reflect light and then we find out that light
moves with c regardless of the speed of the mirror.
My question is why do we need a theory to replace
the galilian composition of velocities?i mean this
can be explained by saying that...
I want a book that explains everything about
Michelson Morley experiment. The one that says
light moves with c regardless of the speed of the source
and also the one that says light appeared to move with
C for all observers.
I'm doing the experiment for a project using a setup as so:
https://imgur.com/a/7vfg2
In the derivation of the formula I used the amplitude of the oscillation on the ruler of the laser, basically taking it as the arclength of the arc drawn by the laser spot as the bar rotates inside the...
Hello everyone.
I want to ask some questions about dcqe experiments results which are bugging my mind. It is so hard to find reliable sources in my native language so I'm here. Also sorry for my scuffed english.
Assuming we all know the famous experiment setup, I am directly passing to the...
I have previously posted Preserving local realism in the EPR experiment
.
I have since given up on simulating local realism since I now understand it is impossible. However I have not given up on causality. Attached is code that simulates the EPR experiment and gives the same result as what...
Suppose we have a particle, let's say an electron, in a box of size D. And we add another one next to it at some distance L center to center. How do we solve for the wavefunctions of the electron. Can it be solved in normal QM or do we need QFT. Thanks.
Homework Statement
Ok so in my lab we have been given a set-up as shown below
Minus the horse shoe dector on the right hand side. During this set-up up we need to find the point where the balance point and centre of gravity are equal (as I understand) here is exactly what my script say...
I have some serious issues trying to understand the idea of the spin in the context of the Stern-Gerlach experiment and would appreciate some assistance!
Assuming that a homogenous magnetic field ##B## in the "North-wards" ##z##-direction, assume that there is a magnetic dipole moment ##\mu##...
So as we know at the bottom of the ocean we have water cooled to 0-4 degrees celsius which is very dense and also compressed due to the pressure.
Imagine we lower a few kilometres long pipe to the bottom of the ocean (it's made of material that is strong enough to sustain pressure). It's closed...
Hi there,
I'm looking for some interesting activities regarding nuclear physics in high school.
I already have:
- building a cloud chamber with dry ice or peltier modules
- simulating radioactive decay with dice
- simulating Rutherford's experiment hitting with glass marbles a hidden target...
Hello, I have found a YT video which shows some kind of experiment. You see a wooden toothpick suspended on a spider's web single thread and covered by a jar. Then a you see a man who holds a few plastic straws in his hand. He closes them to the toothpick and it slowly moves (which is seen if...
Hey,
I'm trying to adapt the Bragg condition for the David-Germer experiment, so I can then use their experimental results to show that the measured wavelength is compatible to the wavelength theorized by De Broglie. However I'm having issue with the calculation, any help would be much...
Homework Statement
Homework EquationsThe Attempt at a Solution
Time period of a simple pendulum is given by 2π√(L/g) .
By uniform mass distribution , I am assuming density of mass of bob to be constant .
I don't understand how time period depends on the mass of the bob of a simple pendulum .