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The Uncertainty Principle Is Untenable

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Subject: The Uncertainty Principle Is Untenable
From: "adstone" <adstone@cern.ch>
Date: Wed, 23 Apr 2003 18:18:37 +0800
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THE UNCERTAINTY PRINCIPLE IS UNTENABLE

 
By re-analysing Heisenberg's Gamma-Ray Microscope experiment and the ideal 
experiment from which the uncertainty principle is derived, it is actually 
found that the uncertainty principle can not be obtained from them. It is 
therefore found to be untenable. 

Key words: 
uncertainty principle; Heisenberg's Gamma-Ray Microscope Experiment; ideal 
experiment 

Ideal Experiment 1

                 Heisenberg's Gamma-Ray Microscope Experiment


A free electron sits directly beneath the center of the microscope's lens 
(please see AIP page http://www.aip.org/history/heisenberg/p08b.htm or diagram 
below) . The circular lens forms a cone of angle 2A from the electron. The 
electron is then illuminated from the left by gamma rays--high energy light 
which has the shortest wavelength. These yield the highest resolution, for 
according to a principle of wave optics, the microscope can resolve (that is, 
"see" or distinguish) objects to a size of dx, which is related to and to the 
wavelength L of the gamma ray, by the expression: 

dx = L/(2sinA) (1) 

However, in quantum mechanics, where a light wave can act like a particle, a 
gamma ray striking an electron gives it a kick. At the moment the light is 
diffracted by the electron into the microscope lens, the electron is thrust to 
the right. To be observed by the microscope, the gamma ray must be scattered 
into any angle within the cone of angle 2A. In quantum mechanics, the gamma ray 
carries momentum as if it were a particle. The total momentum p is related to 
the wavelength by the formula, 

p = h / L, where h is Planck's constant. (2) 

In the extreme case of diffraction of the gamma ray to the right edge of the 
lens, the total momentum would be the sum of the electron's momentum P'x in the 
x direction and the gamma ray's momentum in the x direction: 

P' x + (h sinA) / L', where L' is the wavelength of the deflected gamma ray. 

In the other extreme, the observed gamma ray recoils backward, just hitting the 
left edge of the lens. In this case, the total momentum in the x direction is: 

P''x - (h sinA) / L''. 

The final x momentum in each case must equal the initial x momentum, since 
momentum is conserved. Therefore, the final x momenta are equal to each other: 

P'x + (h sinA) / L' = P''x - (h sinA) / L'' (3) 

If A is small, then the wavelengths are approximately the same, 

L' ~ L" ~ L. So we have 

P''x - P'x = dPx ~ 2h sinA / L (4) 

Since dx = L/(2 sinA), we obtain a reciprocal relationship between the minimum 
uncertainty in the measured position, dx, of the electron along the x axis and 
the uncertainty in its momentum, dPx, in the x direction: 

dPx ~ h / dx or dPx dx ~ h. (5) 

For more than minimum uncertainty, the "greater than" sign may added. 

Except for the factor of 4pi and an equal sign, this is Heisenberg's 
uncertainty relation for the simultaneous measurement of the position and 
momentum of an object. 

Re-analysis

To be seen by the microscope, the gamma ray must be scattered into any angle 
within the cone of angle 2A. 

The microscope can resolve (that is, "see" or distinguish) objects to a size of 
dx, which is related to and to the wavelength L of the gamma ray, by the 
expression: 

dx = L/(2sinA) (1) 

This is the resolving limit of the microscope and it is the uncertain quantity 
of the object's position. 

The microscope can not see the object whose size is smaller than its resolving 
limit, dx. Therefore, to be seen by the microscope, the size of the electron 
must be larger than or equal to the resolving limit. 

But if the size of the electron is larger than or equal to the resolving limit 
dx, the electron will not be in the range dx. Therefore, dx can not be deemed 
to be the uncertain quantity of the electron's position which can be seen by 
the microscope, but deemed to be the uncertain quantity of the electron's 
position which can not be seen by the microscope. To repeat, dx is uncertainty 
in the electron's position which can not be seen by the microscope. 

To be seen by the microscope, the gamma ray must be scattered into any angle 
within the cone of angle 2A, so we can measure the momentum of the electron. 

dPx is the uncertainty in the electron's momentum which can be seen by 
microscope. 

What relates to dx is the electron where the size is smaller than the resolving 
limit. When the electron is in the range dx, it can not be seen by the 
microscope, so its position is uncertain. 

What relates to dPx is the electron where the size is larger than or equal to 
the resolving limit .The electron is not in the range dx, so it can be seen by 
the microscope and its position is certain. 

Therefore, the electron which relates to dx and dPx respectively is not the 
same. What we can see is the electron where the size is larger than or equal to 
the resolving limit dx and has a certain position, dx = 0. 

Quantum mechanics does not rely on the size of the object, but on Heisenberg's 
Gamma-Ray Microscope experiment. The use of the microscope must relate to the 
size of the object. The size of the object which can be seen by the microscope 
must be larger than or equal to the resolving limit dx of the microscope, thus 
the uncertain quantity of the electron's position does not exist. The gamma ray 
which is diffracted by the electron can be scattered into any angle within the 
cone of angle 2A, where we can measure the momentum of the electron. 

What we can see is the electron which has a certain position, dx = 0, so that 
in no other position can we measure the momentum of the electron. In Quantum 
mechanics, the momentum of the electron can be measured accurately when we 
measure the momentum of the electron only, therefore, we have gained dPx = 0. 

And, 

dPx dx =0. (6) 

Ideal experiment 2

Single Slit Diffraction Experiment


Suppose a particle moves in the Y direction originally and then passes a slit 
with width dx(Please see diagram below) . The uncertain quantity of the 
particle's position in the X direction is dx, and interference occurs at the 
back slit . According to Wave Optics , the angle where No.1 min of interference 
pattern is can be calculated by following formula: 

sinA=L/2dx (1) 

and L=h/p where h is Planck's constant. (2) 

So the uncertainty principle can be obtained 

dPx dx ~ h (5) 

Re-analysis

According to Newton first law , if an external force in the X direction does 
not affect the particle, it will move in a uniform straight line, ( Motion 
State or Static State) , and the motion in the Y direction is unchanged 
.Therefore , we can learn its position in the slit from its starting point. 

The particle can have a certain position in the slit and the uncertain quantity 
of the position is dx =0. According to Newton first law , if the external force 
at the X direction does not affect particle, and the original motion in the Y 
direction is not changed , the momentum of the particle int the X direction 
will be Px=0 and the uncertain quantity of the momentum will be dPx =0. 

This gives: 

dPx dx =0. (6) 

No experiment negates NEWTON FIRST LAW. Whether in quantum mechanics or 
classical mechanics, it applies to the microcosmic world and is of the form of 
the Energy-Momentum conservation laws. If an external force does not affect the 
particle and it does not remain static or in uniform motion, it has disobeyed 
the Energy-Momentum conservation laws. Under the above ideal experiment , it is 
considered that the width of the slit is the uncertain quantity of the 
particle's position. But there is certainly no reason for us to consider that 
the particle in the above experiment has an uncertain position, and no reason 
for us to consider that the slit's width is the uncertain quantity of the 
particle. Therefore, the uncertainty principle, 

dPx dx ~ h (5) 

which is derived from the above experiment is unreasonable. 

Conclusion


From the above re-analysis , it is realized that the ideal experiment 
demonstration for the uncertainty principle is untenable. Therefore, the 
uncertainty principle is untenable. 

 

Reference:
1. Max Jammer. (1974) The philosophy of quantum mechanics (John wiley & sons , 
Inc New York ) Page 65
2. Ibid, Page 67
3. http://www.aip.org/history/heisenberg/p08b.htm 

 

Author : BingXin Gong
Postal address : P.O.Box A111 YongFa XiaoQu XinHua HuaDu
               GuangZhou 510800 P.R.China

E-mail: hdgbyi@public.guangzhou.gd.cn
Tel: 86---20---86856616 


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