# The basic principles of quantum mechanics

Then this could just mean the frequency with which we measure the particle would have to change for us to measure it in another state? However, the probability of a given system jumping into a given final state can be predicted.

Log in to post comments By ColdWinterWind not verified on 28 Jan permalink When I first learned about QM as a teenager I was fascinated by it's weirdness and though it represents a completely new paradigm. These properties suggested a model in which electrons circle around the nucleus like planets orbiting a sun.

Emission spectrum of hydrogen. Rather, multiple scientists contributed to a foundation of three revolutionary principles that gradually gained acceptance and experimental verification between and Though quantized properties were invented as but a mere mathematical trick, they explained so much that they became the founding principle of QM.

Not as much as Peter Morgan at 1, but it still strikes me as a bit misleading. Each measurements puts the system back into a single definite state, and the evolution has to start over. Sometimes it happens and sometimes it doesn't -- it depends on how you do the measurement.

Certain properties, such as position, speed and color, can sometimes only occur in specific, set amounts, much like a dial that "clicks" from number to number.

InWerner Heisenberg German mathematical physicistproposed the 'uncertainty principle'. That is true by definition, but if by "quantum states" one means any states QM deals with then it's not true as position, momentum, time and energy - the four most fundamental observables imho - are continuous in general.

Quantum particles behave like particles, in that they are discrete and in principle countable. A second, related, puzzle was the emission spectrum of atoms.

In other words, any state can be regarded as a superposition of two or more other states. So of a field equation after you get the solutions you go to see what are the boundary conditions and if they are compact then your measurements are discrete: My comments are not intended as suggested rephrasings!

By Matt Leifer not verified on 20 Jan permalink I was also a bit taken aback by "quantum states are discrete". For a more general audience the nitpicking below is probably largely below the radar.

After a measurement is made, the state of the particle is absolutely determined, and all subsequent measurements on that particle will return produce exactly the same outcome. This challenged a fundamental assumption of classical mechanics, which said that such properties should exist on a smooth, continuous spectrum.

Log in to post comments By Peter not verified on 24 Feb permalink Or maybe the universe splits into two separate parts at the moment of the measurement; why not? I am not saying this has to be the case only that it is a possibility which has to be kept in mind. By now I am pretty certain that once a proper TOE is developed and I am sure it will be eventually most of this weirdness will be gone with the exception of things originating from relativity which imho IS fundamental. This would also apply, as would be shown a few years later, when an electron "jumps" between quantized orbits. At least, for the relatively naive reader like myself.Quantum physics is the branch of science, that deals with the behavior and characteristics of matter (in the subatomic level) and energy.

It is also referred to as quantum mechanics. Fundamental Principles of Quantum Mechanics There is nothing special about the transmission and absorption of photons through a polarizing film. Exactly the same conclusions as those outlined above are obtained by studying other simple experiments, such as the interference of photons (see Dirac, Section I.3), and the Stern-Gerlach experiment (see Sakurai, Chapter 1; Feynman, Chapter 5).

Answers to all problems are included in the text. After you complete this text, I would suggest reading the Bell That Rings Light by Dorothy Wallace and Joseph J BelBruno. If you are still curious after working through these two books, then you should then go for Quantum Mechanics by Griffiths. The basics of quantum mechanics Why quantum mechanics is necessary for describing molecular properties we krow that all molccules are made of atoms which.

in turn. contain nu-clei and electrons. As I discuss in this introcjuctory section, the equations that. Principles of Quantum Mechanics Quantum mechanics is the most successful quantitative theory ever produced.

Not a single one of the untold thousands of experiments done to test it has ever found the basic. principles that characterize quantum mechanics in this chapter. Quantum mechanics is a relatively new field of physics that was developed at the beginning of the last century as the common effort of different scientists.

The basic principles of quantum mechanics
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