Heisenberg's Uncertainty Principle
"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."  Bertrand Russell ( 1872  1970 )
This can also be seen in the equation
where the shorter the wavelength of the mass  particle, the higher will be its frequency and hence carry a greater amount of energy which translates into a larger amount of momentum.
That is, as composite wave length becomes shorter, all of the composite characteristics of the wave  particle ( frequency, energy and hence momentum ) will gain unit magnitudes in their respective probability distributions. And the opposite will also be true as well; that is, as the composite wave length of a wave  particle becomes longer, therefore the other composite characteristics of frequency, energy and momentum will also all decline in their respective unit magnitudes and will do so as a probabilistic distribution.
Hence, whenever position of a mass  particle of wavelength is more accurately determined owing to a given opening in a wave  diffraction experiment, the less accurate will momentum be determined. And, the opposite is also true: namely, that as momentum of a mass  particle of wavelength is more accurately predetermined, the exact location position will be less accurately identified in any wave  diffraction experiment.
For example, if we shoot a given mass  particle thru a slit opening which defines a given allowable wavelength to pass,
we also discover a probability pattern of strikes or "spreading out" ( distribution of intensity ) on an observation screen of this wave diffraction phenomenon for the mass  particle.
Now, for slit openings considerably greater than the mass  particle's wavelength , the mass  particle propagates thru more nearly in a straight line of passage and can be observed as such. However when the slit opening is more nearly constrained to the theoretical wavelength of the mass  particle, all of the wave characteristics of the mass  particle become apparent as shown here:
Finally, as the slit opening is adjusted for greater or lesser composite wavelengths of the mass  particle to pass, we discover that there will always be an lower bound for the conjugate of the composites of wavelengths and momenta as follows:
And in terms of overall position and momentum, the probability distribution density curves for intensities of momentum will again arrive as:
Hence the uncertainties in either the location and/or the momentum of a mass  particle in terms of its wave function at any given instant must be at least equal to or greater than , Planck's Constant.
Therefore, if for example we attempt to "pin down" or locate a mass  particle, Heisenberg's calculation will give us higher and higher velocities ( remember: momentum = mass x velocity ) for more and more precise locations. On the other hand, if we somehow slow down the mass  particle or even achieve a precise velocity ( or momentum ) for the mass  particle, the location "spreads out" and becomes fuzzy and hence probabilistic!
Oh, also notice that Heisenberg's Uncertainty Principle has absolutely nothing to do with any interference with the mass  particle by the observer's measurement technique or instruments involved. It rather solely pertains to nature's inherent wave function for subatomic mass  particles and from which .
Examples Using the Heisenberg Uncertainty Principle^{∗}
The Large Hadron Collider ( LHC ) at CERN will be accelerating protons close to the speed of light, , whose rest mass is
§ Case 1: Before achieving smashing protons at close to , let's suppose that the protons are speeding at with a 1% measurement precision or
Therefore, the uncertainty in measurement of proton velocity is
and by the Heisenberg Uncertainty Principle, the uncertainty in simultaneously determining proton velocity and position is given as follows:
§ Case 2: The LHC at CERN, however, will be attempting to smash protons at the speed of light, or at least virtually close to it! The uncertainty in proton position with the same 1% measuring precision as for proton velocity, becomes as follows:
§ Case 2a: Suppose that the smashing of protons at the speed of light does actually occur but only for a time duration of with a 1% precision in time measurement.
Heisenberg's Uncertainty Principle tells us that
§ Case 2b: The rest energy, , of the proton is
The amount of time that it would take to make this energy measurement to a precision of 1% is found similarly as before.
^{∗}note : some of these examples are used in the future upcoming Relativity Science Calculator Mac application for Heisenberg Uncertainty Principle.
§ References:
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