Speed of Light

The speed of light being a constant sounds like a simple statement. But there is more to it, quite a bit more. Let’s look at what this constancy really means. Met die eerste oogopslag, it says that if you are standing somewhere, and there is a ray of light going from your right to left, it has a speed c. And another ray of light going from left to right also has a speed c. So far, so good. Now let’s say you are in a rocket ship, soos getoon in die figuur hieronder, moving from right to left.

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Spesiale relatiwiteitsteorie

Wanneer ons hoor van Einstein en die spesiale relatiwiteit (of die spesiale relatiwiteitsteorie, om die regte naam te gebruik), Ons dink aan die beroemde E = mc^2 vergelyking, en vreemde dinge soos die tweeling paradoks. Terwyl hierdie dinge is almal ware en belangrike, die probleem SR probeer om op te los is 'n heeltemal ander een. Dit is 'n poging om 'n basiese beginsel te verdedig in fisika.
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Quantum Field Theory

In this post on Quantum Mechanics (QM), we will go a bit beyond it and touch upon Quantum Field Theory – the way it is used in particle physics. In the last couple of posts, I outlined a philosophical introduction to QM, as well as its historical origin – how it came about as an ad-hoc explanation of the blackbody radiation, and a brilliant description of the photoelectric effect.
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Historical Origin of Quantum Mechanics

In hierdie afdeling, we will try to look at the historical origin of Quantum Mechanics, which is usually presented succinctly using scary looking mathematical formulas. The role of mathematics in physics, as Richard Feynman explains (in his lectures on QED given in Auckland, New Zealand in 1979, available on YouTube, but as poor quality recordings) is purely utilitarian.
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Kwantummeganika

Kwantummeganika (QM) is the physics of small things. How do they behave and how do they interact with each other? Conspicuously absent from this framework of QM is why. Why small things do what they do is a question QM leaves alone. En, if you are to make any headway into this subject, your best bet is to curb your urge to ask why. Nature is what she is. Our job is to understand the rules by which she plays the game of reality, and do our best to make use of those rules to our advantage in experiments and technologies. Ours is not to reason why. Regtig.

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Classical Physics

The main difficulty in describing particle physics to general public is the fact that it is built on modern physics. Even if you are physics aficionado and did extremely well in your high school physics, what you have learned and loved is classical physics. The difference between classical physics and modern physics is not just more physics, but a completely new way of looking at the reality around us.
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reduksionisme

In al ons wetenskaplike pogings, Ons gebruik dieselfde hoë-vlak tegnieke te verstaan ​​en te bestudeer dinge. Die mees algemene tegniek is reduksionisme. Dit is gebaseer op die oortuiging dat die gedrag, eienskappe en struktuur van 'n groot en komplekse voorwerpe kan verstaan ​​word in terme van hul eenvoudiger bestanddele. Met ander woorde, Ons probeer om die geheel te verstaan (die heelal, byvoorbeeld) in terme van kleiner, verminder bestanddele (soos deeltjies).

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Deeltjies en Interaksies

Onlangs, Ek het 'n praatjie oor deeltjies en interaksies te klasmaats my dogter se wat van plan was om op 'n reis na DESY, Duitsland en wou 'n idee van wat dit was alles oor het. Soos my eerste sprake van hierdie soort, Ek was 'n bietjie senuweeagtig, want ek het nie geweet watter vlak, en agtergrond, Ek moet die praatjie by te pen. Ek wou nie dit te basiese maak, wat ek gedink het sou 'n vermorsing van tyd wees. Ook het ek wil dit te tegnies te maak, wat dit ook nutteloos in 'n ander manier sou maak.

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Sensory and Physical Worlds

Animals have different sensory capabilities compared to us humans. Cats, byvoorbeeld, can hear up to 60kHz, while the highest note we have ever heard was about 20kHz. Apparently, we could hear that high a note only in our childhood. So, if we are trying to pull a fast one on a cat with the best hifi multi-channel, Dolby-whatever recording of a mouse, we will fail pathetically. It won’t be fooled because it lives in a different sensory world, while sharing the same physical world as ours. There is a humongous difference between the sensory and physical worlds.

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