The Observer Effect in Quantum Mechanics 
One of the weirdness aspect of a quantum environment is that the act of observation defines its reality.
For example as long as you are not actually observing an electron, its behavior is that of a wave of probability however moment you do it is becomes a particle. But as soon as you are not looking at it it behaves like a wave again. That is rather weird, and no ordinary idea of classical objectivity can accommodate it."
Bohr summarized this reality as follows:…"however far the [quantum physical] phenomena transcend the scope of classical physical explanation, the account of all evidence must be expressed in classical terms. The argument is simply that by the word "experiment" we refer to a situation where we can tell others what we have done and what we have learned and that, therefore, the account of the experimental arrangements and of the results of the observations must be expressed in unambiguous language with suitable application of the terminology of classical physics.
This crucial point…implies the impossibility of any sharp separation between the behavior of atomic objects and the interaction with the measuring instruments which serve to define the conditions under which the phenomena appear…. Consequently, evidence obtained under different experimental conditions cannot be comprehended within a single picture, but must be regarded as complementary in the sense that only the totality of the phenomena exhausts the possible information about the objects.
In other words the choice one makes on how to observe a quantum object determines if it is a particle or wave.
This behavior is exposed by the double slit experiment in which a coherent source of light illuminates a screen after passing through a thin plate with two parallel slits cut in it. The wave reality of light causes the light waves passing through both slits to interfere, creating an interference pattern of bright and dark bands on the screen. However, when being observed, the light is always found to be absorbed as discrete particles, called photons.

However one of the reason it is so difficult to understand how observation effects a quantum system may be because too much attention has been focused on its mathematical properties and not enough on its physical meaning in a spacetime environment. This is made even more difficult because they are defined in terms of the spatial properties of a quantum system instead of its spacetime properties.
This suggest one may be able to obtain a better understanding of what happens when one observes it if one could view it in terms its spatial instead of its time or spacetime properties.
Einstein gave us the ability to do this when he use the equation E=mc^2 and the constant velocity of light to define the geometric properties of spacetime because it provided a method of converting a unit of time he associated with energy to unit of space associate with position. Additionally because the velocity of light is constant he also defined a one to one quantitative correspondence between his spacetime universe and one made up of four *spatial* dimensions.
The fact that one can use Einstein’s equations to qualitatively and quantitatively redefine the curvature in spacetime he associated with energy in terms of four *spatial* dimensions is one bases for assuming as was done in the article “Defining energy?” Nov 27, 2007 that all forms of energy can be derived in terms of a spatial displacement in a "surface" of a threedimensional space manifold with respect to a fourth *spatial* dimension.
However redefining the physical properties of quantum system in terms of its spatial instead of its time components would allow one to derive a single picture of its wave and particle characteristics thereby allowing one to understand how observation effects our perception of it.
For example the article “Why is energy/mass quantized?” Oct. 4, 2007 showed one can derive its physicality by extrapolating the laws of classical wave mechanics in a threedimensional environment to a matter wave on a "surface" of a threedimensional space manifold with respect to a fourth *spatial* dimension.
Briefly it showed the four conditions required for resonance to occur in a classical environment, an object, or substance with a natural frequency, a forcing function at the same frequency as the natural frequency, the lack of a damping frequency and the ability for the substance to oscillate spatial would occur in one consisting of four spatial dimensions.
The existence of four *spatial* dimensions would give a matter wave the ability to oscillate spatially on a "surface" between a third and fourth *spatial* dimensions thereby fulfilling one of the requirements for classical resonance to occur.
These oscillations would be caused by an event such as the decay of a subatomic particle or the shifting of an electron in an atomic orbital. This would force the "surface" of a threedimensional space manifold to oscillate with the frequency associated with the energy of that event.
The oscillations caused by such an event would serve as forcing function allowing a resonant system or "structure" to be established space.
Therefore, these oscillations in a "surface" of a threedimensional space manifold would meet the requirements mentioned above for the formation of a resonant system or "structure" in fourdimensional space if one extrapolated them to that environment.
Classical mechanics tells us the energy of a resonant system can only take on the discrete or quantized values associated with it fundamental or a harmonic of its fundamental frequency.
Hence, these resonant systems in four *spatial* dimensions would be responsible for the discrete quantized energy associated with quantum mechanical systems.
Yet it also allowed one to derive the physical boundaries responsible for the creation of a particle in terms of the geometric properties of four *spatial* dimensions.
For example in classical physics, a point on the twodimensional surface of paper is confined to that surface. However, that surface can oscillate up or down with respect to threedimensional space.
Similarly an object occupying a volume of threedimensional space would be confined to it however, it could, similar to the surface of the paper oscillate “up” or “down” with respect to a fourth *spatial* dimension.
The confinement of the “upward” and “downward” oscillations of a threedimension volume with respect to a fourth *spatial* dimension is what defines the spatial boundaries of the resonant system associated with the particle component of it’s wave properties in the article “Why is energy/mass quantized?“
However assuming its wave energy is result of a displacement in four *spatial* dimension instead of four dimensional spacetime as was done in the article “Defining energy?” Nov 27, 2007 allows one to not only derive the physicality of its particle component as was just done but also the reason why when you are not actually observing it its behavior is that of a wave however moment you do it is becomes a particle with a physically defined position.
For example Classical wave Mechanics tell us that because of the continuous properties of waves, the energy the article “Why is energy/mass quantized?” associated with a quantum system is free to move over the entire "surface" of threedimensional space with respect to a fourth *spatial* dimension similar to how the wave generated by a vibrating ball on a surface of a rubber diaphragm are free to move or be distributed over its entire surface. However to observer it one would have to touch its surface with a probe thereby restricting the wave motion of its surface.
Similar the wave reality of a quantum system that is not being observed is allow to freely move though space as is done in the double slit experiment when it moves though the slits undetected thereby allowing is wave reality become observable as demonstrated by a diffraction pattern on a screen placed behind the slits.
In other words similar to the rubber diaphragm there is a probability that its wave reality could be found anywhere on the "surface" of three dimensional space.
However if we decide to restrict or redirect some of its energy by probing or observing it becomes a particle that appears to be at a specific place in space and time because as was shown in the article “Why is energy/mass quantized? the act of observation confines its wave component to specific volume thereby allowing the resonant system that article showed was responsible for its particle reality to become reality.
In other words by assuming space it composed of four spatial dimensions instead of four dimensional spacetime one can understand why the act of observation defines the reality of a quantum environment by extrapolating our experiences in a threedimensional environment to a fourth *spatial* dimension.
It should be remember that Einstein’s genius allows us to choose whether to define the reality of a quantum system in either a spacetime environment or one consisting of four *spatial* dimension when he derived its physical geometry in terms of the constant velocity of light.
Later Jeff
Copyright Jeffrey O’Callaghan 2015
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Bohr summarized his complementary perspective on reality as follows:…"however far the [quantum physical] phenomena transcend the scope of classical physical explanation, the account of all evidence must be expressed in classical terms. The argument is simply that by the word "experiment" we refer to a situation where we can tell others what we have done and what we have learned and that, therefore, the account of the experimental arrangements and of the results of the observations must be expressed in unambiguous language with suitable application of the terminology of classical physics.
This crucial point…implies the impossibility of any sharp separation between the behavior of atomic objects and the interaction with the measuring instruments which serve to define the conditions under which the phenomena appear…. Consequently, evidence obtained under different experimental conditions cannot be comprehended within a single picture, but must be regarded as complementary in the sense that only the totality of the phenomena exhausts the possible information about the objects."
The "Invisible Reality" of Quantum Theory with Alan Alda, Brian Greene 
Albert Einstein and Leopold Infeld also addressed this issue in their book The Evolution of Physics, when they asked "what is light really? Is it a wave or a shower of photons? There seems no likelihood for forming a consistent description of the phenomena of light by a choice of only one of the two languages. It seems as though we must use sometimes the one theory and sometimes the other, while at times we may use either. We are faced with a new kind of difficulty. We have two contradictory pictures of reality; separately neither of them fully explains the phenomena of light, but together they do."
In other words the quantum world has duel non overlapping realities: one consisting of waves; the other particles and which one we observe depends on how we observe it.
This is in stark contrast to the classical one we all live in which defines only one reality based on cause and effect.
However one of the reasons it has been it is so difficult to understand why these dual realties exist may be because too much attention has been focused on the mathematics that describe it and not enough on their physical meaning in our classical environment.
Another reason may be because most have tried to integrate them into a spacetime environment even though they are primarily defined in terms of the spatial properties of probabilities.
This suggest we may be able to better understand why the quantum world possess two distinct realties based on the single reality of a classical world of cause and effect if we view them in terms of spatial properties instead of their spacetime ones.
Einstein gave us the ability to do this when he use the equation E=mc^2 and the constant velocity of light to define the geometric properties of spacetime because it provided a method of converting a unit of time he associated with energy to unit of space associate with position. Additionally because the velocity of light is constant he also defined a one to one quantitative correspondence between his spacetime universe and one made up of four *spatial* dimensions.
The fact that one can use Einstein’s equations to qualitatively and quantitatively redefine the curvature in spacetime he associated with energy in terms of four *spatial* dimensions is one bases for assuming as was done in the article “Defining energy?” Nov 27, 2007 that all forms of energy can be derived in terms of a spatial displacement in a "surface" of a threedimensional space manifold with respect to a fourth *spatial* dimension.
However defining the dimensional properties of quantum system in terms of its spatial instead of its time components would allow one to understand why a quantum environment possess two distinct realities by extrapolating the laws governing cause and effect in the classical world to them.
For example the article “Why is energy/mass quantized?” Oct. 4, 2007 showed one can derive quantum properties of energy/mass by extrapolating the laws of classical wave mechanics in a threedimensional environment to a matter wave on a "surface" of a threedimensional space manifold with respect to a fourth *spatial* dimension.
Briefly it showed the four conditions required for resonance to occur in a classical environment, an object, or substance with a natural frequency, a forcing function at the same frequency as the natural frequency, the lack of a damping frequency and the ability for the substance to oscillate spatial would occur in one consisting of four spatial dimensions.
The existence of four *spatial* dimensions would give a matter wave the ability to oscillate spatially on a "surface" between a third and fourth *spatial* dimensions thereby fulfilling one of the requirements for classical resonance to occur.
These oscillations would be caused by an event such as the decay of a subatomic particle or the shifting of an electron in an atomic orbital. This would force the "surface" of a threedimensional space manifold to oscillate with the frequency associated with the energy of that event.
The oscillations caused by such an event would serve as forcing function allowing a resonant system or "structure" to be established space.
Therefore, these oscillations in a "surface" of a threedimensional space manifold would meet the requirements mentioned above for the formation of a resonant system or "structure" in fourdimensional space if one extrapolated them to that environment.
Classical mechanics tells us the energy of a resonant system can only take on the discrete or quantized values associated with its fundamental or a harmonic of its fundamental frequency.
Hence, these resonant systems in four *spatial* dimensions would be responsible for the discrete quantized energy associated with the quantum mechanical systems.
Yet it also allowed one to derive the physical boundaries of a particle in terms of the geometric properties of four *spatial* dimensions.
For example in classical physics, a point on the twodimensional surface of paper is confined to that surface. However, that surface can oscillate up or down with respect to threedimensional space.
Similarly an object occupying a volume of threedimensional space would be confined to it however, it could, similar to the surface of the paper oscillate “up” or “down” with respect to a fourth *spatial* dimension.
The confinement of the “upward” and “downward” oscillations of a threedimension volume with respect to a fourth *spatial* dimension is what defines the spatial boundaries of the resonant system associated with the particle component of its wave properties in the article “Why is energy/mass quantized?” Oct. 4, 2007.
In other words one can use classical wave mechanics to explain why a quantum system can possess both wave and particle properties.
However it does not help us to understand why they define two nonoverlapping realties.
In other words it does not help us to understand why if one devises and experiment to observe its particle properties one cannot at the same time observe its wave reality while if one observes its particle reality one cannot observe it wave properties.
However one can use the properties of classical reality to understand the causality of the complementary or dual real of quantum mechanics.
For example Classical Mechanics tell us that because of the continuous properties of waves, the energy the article "Why is energy/mass quantized?” Oct. 4, 2007 associated with a quantum system would be free to move over the entire "surface" of threedimensional space with respect to a fourth *spatial* dimension similar to how the wave generated by a vibrating ball on a surface of a rubber diaphragm would be free to move over its entire surface. However to observe the movement of the rubber diaphragm one must physically touch it with a probe thereby restricting its movement
Similarly to observe the movement of a quantum system one must use a probe which would restrict its movement.
However this also allows one to understand why observing a quantum system effects its reality as is demonstrate in the double slit experiment.
In this experiment the wave reality of a quantum system is demonstrated by the bright and dark interference bands produced on the screen after being allowed to freely pass through between two slits on a screen, However, it is always found to be absorbed at the screen at discrete points, as individual particles (not waves), while the interference pattern appears as varying density of these particle hits on the screen. Furthermore, its particle reality is demonstrated when someone puts detectors at the slits he finds that each detected photon passes through one slit (as would a classical particle), and not through both slits (as would a wave).
These results demonstrate the principle of wave–particle duality.
In the first part of this experiment the wave properties of a quantum system defines its reality because it is allowed to move freely through space. This would be analogous to classical reality of sound waves created by a random source in that they show no properties of quantization.
However classical wave mechanics tells us that if one if one restrict the movement of a wave as is done in a pipe organ it will form a quantized resonant system.
For example if one restricts sound waves as is done in an organ pipe its output becomes quantized because it amplifies one of its wave components while diminishing all others.
As the article “Why is energy/mass quantized?” Oct. 4, 2007 showed the particle "reality" of a quantum system is the result of the restricting its wave "reality" which must always happen when an observation is made.
In other words as the reason why the particle reality of a quantum environment only occurs when an observation is made is because that act restricts the movement of its wave reality thereby creating the resonant structure associated with its particle properties defined in the article “Why is energy/mass quantized?” Oct. 4, 2007.
In other words the reason the interference pattern appears as varying density of these particle hits on the screen in the double slit experiment is because as was mentioned earlier observing a quantum system requires one to restrict its wave prosperities thereby causing the resonant system the article “Why is energy/mass quantized?” Oct. 4, 2007 associated with its particle really.
Additionally their varying density occurs because these resonant systems will most likely occur where the magnitude of the wave component is maximum and drop off as it decreases. Therefore their position on the screen will form a wave interference pattern .
The reason why the two realties are complimentary or cannot be simultaneous observed is similar to why one cannot observe ice and water at the same time. For example in an environment consisting of water that is well below freezing the reality is frozen water while its reality when it is above freezing is water. Additionally our classical experiences tell us that these two states are complementary because they cannot be both at the same time but have to one or the other.
Similarly in an unobserved quantum environment the wave reality exists because is it allows to move freely through space while as was shown above the restrictions caused by observation makes its particle properties or reality become predominate.
This shows even though a quantum environment consists of two nonoverlapping contradictory pictures of reality one can fully understand their existence by applying the cause and effect relationship of a classical reality to it.
Later Jeff
^{Copyright Jeffrey O’Callaghan 2015}