What is the Uncertainity Principle?

Answer 1

The quantum hypothesis explained the observed rate of emission of radiation from hot bodies very well,but its implications for determinism were not realized until 1926,when another German scientist,Werner Heisenberg,formulated his famous uncertainity principle.In order to predict the future position and velocity of a particle,one has to be able to measure its present position and velocity accurately.The obvoius way to do this is to shine light on the particle.Some of the waves of light will be scattered by the the particle and this will indicate its position.However,one will not be able to determine the position of the particle more accurately than the distance between the wave crests of light,so one needs to use light of a short wavelength in order to measure the position of the particle precisely.Now,by Planck's quantum hypothesis,one cannot use arbitrarily small amount of light;one has to use at least one quantum.This quantum will disturb the particle and change its velocity in a way that cannot be predicted.Moreover,the more accurately one measures the position,the shorter the wavelengthof the light that one needs and hence the higher the energy of a single quantum.So the velocity of the particle will be disturbed by a larger amount.In other words,the more accurately you try to measure ther position of the particle,the less accurately you can measure its speed,and vice versa.
Heisenberg's uncertainity principle is a fundamental,inesacpable property of the world.

Answer 2

In order to predict the future position and velocity of a particle,one has to be able to measure its present position and velocity accurately...

This is where the Uncertainty Principle comes in. Hiesenberg discovered that the more accurately you measure a particles position, the less accurately you can measure its velocity.


This uncertainty leads to some strange effects. For example, in a Quantum Mechanical world, I cannot predict where a particle will be with 100 % certainty. I can only speak in terms of probabilities. For example, I can only say that an atom will be at some location with a 99 % probability, and that there will be a 1 % probability it will be somewhere else (in fact, there will be a small but finite probabilty that it can even be found across the Universe). This is strange.

Answer 3

The uncertainity principle states that it is impossible to calculate both the position and velocity of a moving microscopic particle with absolute accuracy or certainity.

Answer 4

It says that it is impossible to know the both the exact position and momentum of a particle at any given time. There is an uncertainty associated with each measurement.

A common statement of it is:
"The more precisely the POSITION is determined,the less precisely the MOMENTUM is known"

One application is that this is the reason that shape of electron orbitals are determined by a probablilty of where an electron is "most likely to be" rather than thir exact locations.

Answer 5

let me give a simple ans to this qus

according to this principle " It is impossible to determine the position of a fast moving particle at a certain time "

here fast moving particle means electrons

we cant judge the time and position perfectly
when we try to measure the time then the postion will become equally uncertain and vice versa

hope u can get something out of it

Answer 6

You mean the Heisenberg Uncertanty Principal?

it was developed by Werner Heisenberg in 1927. He stated that it is not possible to simultaneously determine the position and momentum of an atomic particle. And the better you know a particle's position, the less you know about its momentum, and vice versa.

Answer 7

(m)

In quantum physics, the Heisenberg uncertainty principle is a mathematical property of a pair of canonical conjugate quantities - usually stated in a form of reciprocity of spans of their spectra. It therefore mathematically limits the accuracy with which it is possible to measure (actually even define) such pairs. In its simplest form, it applies to the position and momentum of any object and implies that if we continue increasing the accuracy with which one of these is measured (or defined), the other will be measured (or defined) with less and less accuracy

Answer 8

it states that the position and momentum of a body cannot be
calculated simultaneously,i.e. if exact position is calculated
then exact momentum can't be calculated.
It was given by heiseinberg.

Answer 9

delta(x)= position
delta(t) =time
delta(p)=momentum
............
delta(x)~delta(p)xdelta(t)
..........................