Saturday, 17 December 2011

Ovens, Quantum Mechanics and acceptance!!!!!!


Good afternoon interweb, I trust I find you well today. I currently have fish fingers in the oven and will shortly be making them into a sandwich with tomato sauce because I can.
My influenza appears to have gone only to be replaced with a common cold so I still am not firing on all cylinders yet.
The whole fish fingers in the oven thing is quite a big thing for me as we have been without an oven for about two weeks now but Kevin the Racing Snake very kindly wired us a new one in yesterday. We still only have one working gas ring but hopefully we will manage to get the new hob plumbed in before Christmas day. Well we can hope anyway.
There is television show on tomorrow night which I have been really looking forward to watching but I will be working so will have to watch the re run on BBC iplayer when I get home around 01.300 hours Monday morning. It is about quantum mechanics and so today I thought I would share with you my very small knowledge on the subject.
Quantum mechanics is the body of scientific principles that explains the behaviour of matter and its interactions with energy on the scale of atoms and atomic particles.
Physics helps us understand matter and energy on a macroscopic level that we can see at work every day, and also how things such as planets and lots of other stuff out there in the universe works. 

It was some time towards the end of the nineteenth century that stuff on the macro and micro levels was observed that physics could not explain and this started to baffle people a bit. Because scientists could not use physics to explain what was going on a whole new science was born and this was quantum mechanics.
Some bloke called Richard Feynman summed up quantum mechanics beautifully when he said “quantum mechanics deals with "nature as she is — absurd.”
quantum mechanics theory ordains that the more closely one pins down one measure (such as the position of a particle), the less precise another measurement pertaining to the same particle (such as its momentum) must become. Put another way, measuring position first and then measuring momentum does not have the same outcome as measuring momentum first and then measuring position; the act of measuring the first property necessarily introduces additional energy into the micro-system being studied, thereby perturbing that system.
Even more disconcerting, pairs of particles can be created as entangled twins — which means that a measurement which pins down one property of one of the particles will instantaneously pin down the same or another property of its entangled twin, regardless of the distance separating them — though this may be regarded as merely a mathematical anomaly, rather than a real one.
As you can see quantum mechanics can get very complicated and there are a very great many rules and probabilities that must be taken into consideration when using it. Below are a few notes that may well help anybody who has actually read this far before watching the programme, I'm sure that Prof Cox will explain things a lot better than most people and lets face it, he makes a better scientist than he ever did a pop star in the band D-Ream or whatever they were called.
 Classical physics also does not accurately describe the universe on the largest scales or at speeds close to that of light. An accurate description requires general relativity.
 The word "quantum" comes from the Latin word for "how much" (as does "quantity"). Something which is "quantized," like the energy of Planck's harmonic oscillators, can only take specific values. For example, in most countries money is effectively quantized, with the "quantum of money" being the lowest-value coin in circulation.
"Mechanics" is the branch of science that deals with the action of forces on objects, so "quantum mechanics" is the part of mechanics that deals with objects for which particular properties are quantized.
 Actually there can be intensity-dependent effects, but at intensities achievable with non-laser sources these effects are unobservable.
 Einstein's photoelectric effect equation can be derived and explained without requiring the concept of "photons". That is, the electromagnetic radiation can be treated as a classical electromagnetic wave, as long as the electrons in the material are treated by the laws of quantum mechanics. The results are quantitatively correct for thermal light sources (the sun, incandescent lamps, etc) both for the rate of electron emission as well as their angular distribution
The classical model of the atom is called the planetary model, or sometimes the Rutherford model after Ernest Rutherford who proposed it in 1911, based on the Geiger-Marsden gold foil experiment which first demonstrated the existence of the nucleus.
 In this case, the energy of the electron is the sum of its kinetic and potential energies. The electron has kinetic energy by virtue of its actual motion around the nucleus, and potential energy because of its electromagnetic interaction with the nucleus.
The model can be easily modified to account of the emission spectrum of any system consisting of a nucleus and a single electron (that is, ions such as He+ or O7+ which contain only one electron).
For a somewhat more sophisticated look at how Heisenberg transitioned from the old quantum theory and classical physics to the new quantum mechanics, see Heisenberg's entryway to matrix mechanics.

Anyway interweb it is about this time that I turn to pearls of wisdom and today will be no exception.
“Acceptance is not a state of passivity or inaction. I am not saying you can't change the world, right wrongs, or replace evil with good. Acceptance is, in fact, the first step to successful action. If you don't fully accept a situation precisely the way it is, you will have difficulty changing it. Moreover, if you don't fully accept the situation, you will never really know if the situation should be changed.”
Peace out y'all, THE BAGSTAXXX

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