Can someone one tell me about Heisenberg's uncertainity principle?

Question

Pleeeeeeeeeeeease help me !!!! I cant understand it!

Answer 1

Heisenberg's Uncertainty Principle is a consequence of what we call the Quantum Mechanical model. It states that there exist pairs of variables (measurable quantities) for which the product of ther uncertainties (errors in their measurements) are a constant.
Two of these pairs are, for example, energy and time, and position and momentum. The consequence of this principle is that trying to measure with greater accuracy of a pair of these variables will necessarily result in a greater error in the determination of the other. The classic example is the following: Suppose you want to determine the position of an electron. You could do so by shooting a photon at it and having it be absorved bby the electron. The absence of the photon on the other side would let you determine the position of the electron. But if you want to make your measurement more exact you would have to use photons of a smaller wave length which implyies higher frecuency and thus more momentum. Since the idea is for the photon to be absorved by the electron, you are changing the momentum of the electron. So you are increasing the uncertainty in its momentum. The Principle comes directly out of Shroedinger's Equation. I hope this helps!

Answer 2

Indeed, Earl D is in great need of further study on the subject. I hope you don't even consider his post. The uncertainty principle is simply that the more accurately you measure the position of the object, the less accurately you can know the speed of the object. And vice versa, the more accurately you measure the speed of an object, the less accurately you can know the position of the object. This has its basis on the fact that you Must intefere with the object you are measuring in the very act of observing it, and that you cannot observe an object (at the subatomic level) without affecting it somehow with regards to its velocity or position. It's that simple really. For detailed info just google Heisenberg and/or uncertaintly principle.

Answer 3

I can't accept that statement.

An electron has a measurable charge. That charge grows as it's position gets closer. The time between growth factors provides velocity. It is therefore possible to know both position and velocity at any given point in time based up measurments to within a factional point. With a computer you can pin-point that down to a possition where you can send out a positron to collise with the electron and be close enough for governmetn work.

Close enough counts for horse shoes, hand grenades and atomic work!

So there is more to this statement than just that.

Television works because of DIRECTED electron flow.

We know the velocity of those electrons because we can measure the time from the discharge at the cathode to the point of phontonic burst.

Television would not work under this statement.

We know the position of those electrons.

That's how the scan works, and that how you get an image with 60 fields of 30 frames every second in America.

Yes, time base errors occur because it's an analog process, but a Time Base Corrector can change this with a slew rate of 100 MS and that's just a home consumer device!

In order for PARTICLE acclerators to WORK we must know the exact POSITION and SPEED of a given particle.

You are talking about a particle so small no microscope can see it.

How does a electron through a particle accelerator split a neutron!?

If we can't work with speed (velocity) and direction (position) we can't hit the nuetron!

It would be a random, hit and miss thing.

Scientists do it day in and day out.

There are 6 million phosphor dots on an HDTV set and electron stream of single electrons hits each of those dots with virtually total accuracy every 1/60th of a second. That's time and space. That's velocity and location. That's X Y Z T

For things to have any varience there would be observable "holes" in the TV picture all the time.

The accuracy is done by clock work of SINE and COSINE based on the angle of transmitter SINE WAVE and angle of receiver SINE WAVE.

For electrons to arrive at the screen at different intervals there would be observable hot spots and holes where the electron totally missed the dot and hit the black mask.

The only phenomenon we get is spatial error caused by distance changes at the edges, causing blue and red shifts to occur on the white dots.

For any significant delay rate there would be observable red and blue shifts on the central dots from scan to scan.

Even undera milli-micron error principle it could take hours and a total assult with a machine electron gun to hit one neutron if this theory was correct.

Scientists do it with a single electron, accelerated and directed to a target.

To do that you have to be accurate to a milli-micron in both speed (velocity) and direction (x,y,z coordiantes).

Yu're talkinga bout a golf ball hitting a basketball.

Answer 4

on the quantum aspect the classical concept of trajectory is incomprehensible, the Heisenberg's uncertainty illustrates that statement. do not forget that a quantum particle is "something" between a particle and a wave... once you write ? p ? q ? ? /2 (the position p is kinetic momentum and q the area), you could be conscious that ? p ? q is an action and in quantum mechanic the fear-loose action is given with suggestions from ?. This inequality is in contract with the actual incontrovertible reality that a quantum action can't be below ?. the following is a common social gathering that may help the truth: evaluate an electron with a momentum px = ?k transferring alongside an axis Ox. We interpose a reveal with a slit of length d alongside Oy. Then if the electron crosses the slit, it is position has been determined with an uncertainty ? y = d. even if the wave linked to this electron is diffracted with an attitude ?? ?/d (see diffraction of sunshine for the time of a slit). Now the momentum alongside the y route is non 0 and it is fee is ? p = py = px tan?? px ?/d = ?k?/d = ? 2?/? ?/d = ? 2?/d then ? y ? p ? h it really is the sturdy order of value of between the Heisenberg inequality... wish it ought to help you!

Answer 5

It states that we cannot know both the position and the velocity of an object. This is true for all objects but is only really important for sub atomic particles (the reason is just one of scale).

The only way that we can get information about an object is by observing the effect that it has on something else or the effect that something else has on it. Either of these will involve an exchange of energy. So, by trying to measure the location or velocity of an object, we will change it's location or velocity. Bouncing a photon off an elephant will allow us to determine something about the elephant's location and velocity but will have very little effect on the elephant. Bouncing a photon off a sub atomic particle will have quite a large effect on it.

This is all concerned with individual objects. The reply that said that we know about velocity and location of electrons in an electron beam in a TV tube is not accurate. We have statistical information about the electrons in the beam but not absolute information about each individual electron. This is important to know because even in an apparently steady state, there is some randomness or noise in the density and velocity of electrons in a beam. This is true of electron movement in all electronic devices and it is this randomness or noise that limits the sensitivity of detectors.

Answer 6

Heisenberg discovered that when trying to determine the position of an electron, it was basically impossible because they are constantly moving at the speed of light. You can only guess where the electron is probably going to be, and that is where you get electron configuration models.

It's kind of like moving your hand really fast in front of you. Instead of seeing just your hand, you see your hand in many places at the same time. Basically, electrons do the same thing, which is why we can't see the nucleus of the atom because of the "electron cloud" that surrounds them.

Answer 7

I sure hope you don't pay attention to Earl D's flawed "answer."

Basically Heisenberg's Uncertainty Principle says that you can determine the location of a subatomic particle, and that you can determine the velocity of a subatomic particle, but you can't determine both of those at the same time.

Answer 8

heisenbergs uncertainity principle states that it is impossible to measure the psition as well as the momentum of a moving particle simultaneously and accurately at the same time
equation is

^x+m^v=h/2pi
^x-uncertainity in position
^v-uncertainity in velocity
the simple way to understand it is like this:think that you want to find the position of a cat from you but as you come close to the cat it runs off,so we cannot measure the position due to the momentum of the cat at the same time.
understood!!!

Answer 9

There are already some pretty good answers
(not Earl's though... I work at a particle accelerator,
and he does not quite get the point).

So I will just add that the
point of the priciple is that this uncertainty is not
something we can overcome by having better
procedures or measuring devices, but rather it is
a fundamental property of the particles.

Answer 10

Basically it states that given an electron's position at a certain point in time, you cannot know its velocity. If you know its velocity, you cannot know its position.

A pretty simple statement really.