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Quote from: hamdani yusuf on 23/07/2022 15:59:18Have you ever worked with high powered radio transmission or power distribution transformers?Yes, I have.
Have you ever worked with high powered radio transmission or power distribution transformers?
Now, here are a couple of questions for you.What is the typical thermal velocity of an electron in a conductor near room temperature andWhat is the drift velocity of an electron in a typical conductor in a transformer or antenna?I don't need any great precision- just order of magnitude is fine.
If the electrons stop moving, will they still have negative temperature?
What's the proportion of transmitter power heating up the antenna compared to the power transmitting radio wave into space around it?
I never measured them. Have you?
Electrons on a radio transmission antenna or a power distribution transformer may have high kinetic energy, but we don't usually say that they have high temperature.
And I know how sound works, so I know that the speed of the molecules in air is about the speed of sound.
Quote from: Bored chemist on 24/07/2022 10:43:51And I know how sound works, so I know that the speed of the molecules in air is about the speed of sound.Except that they don't actually go anywhere! The speed of sound is the phase velocity, not the group velocity of the air mass. Beware of adding to HY's deliberate confusion!This misunderstanding caused lots of problems in the music business during the major COVID panic. Brass instruments were first banned, then only permitted if fitted with a particle filter, and all the brass section had to face the same way "so as not to project bugs at high velocity towards one another". Clearly nonsense. I play the tuba, and exhale at pretty much the same rate with or without the instrument in place. Indeed since the exit port is about 50 cm in diameter, the exit group velocity is a factor of 10,000 lower than from my 0.5 cm nostrils! Even more stupid was the requirement to cover the bell of a saxophone, where the music comes out of the umpteen holes in the side! If you think of a loudspeaker (I also play bass guitar) it makes the same sound with no net air flow. The only reason we blow into wind instruments is to make the initial excitation (brass lip buzz, woodwind reed vibration, or flute/whistle pure edge tone) from which the resonant horn then selects (more or less, depending on your skill) the desired frequency. Sound in a gas is a series of longitudinal pressure waves: each molecule moves forwards and backwards, ending up in pretty much the same place. Now the same applies to electrons in a naive model of an antenna. They may all be jiggling about at random, but what is propagating along the wire is a density wave, not a gross displacement.
Not sure whether that is an admission or a denial, but it was really for HY's education and the amusement of others.
Quote from: hamdani yusuf on 24/07/2022 07:47:33If the electrons stop moving, will they still have negative temperature?It isn't the electrons that have a negative temperature, it's the ensemble of excited and unexcited neon atoms.If you understood the science, you wouldn't be asking questions that make no sense.Try learning.
Who cares?Why do they care?In an ideal world, no energy is dissipated as heat in the antenna, it's all transmitted.In practice the reflected power may be larger than that lost to heat via resistance.
If you can't explain something to a first year student, then you haven't really understood it.Richard Feynman
If the atoms stop moving
The business owners.If their antenna is too thin, or the material has too high specific resistance, then heat dissipation won't be negligible anymore. In extreme cases, the antenna can melt down and stop working.
In an ideal world, no energy is dissipated as heat in the antenna, it's all transmitted.In practice the reflected power may be larger than that lost to heat via resistance.
Although I realize that some concepts can have high complexity they require a lot of connections that they need a lot of memory space, more than an average human can have.... the human explainer ...
Quote from: hamdani yusuf on 25/07/2022 11:27:46If the atoms stop movingThey can't, because they are a gas.Try harder.
But nobody would be so stupid as to design an antenna that way.The resistive losses are usually small compared to others.Oh, hang on I already told you that.
Who cares?Why do they care?
Quote from: hamdani yusuf on 25/07/2022 12:38:50Although I realize that some concepts can have high complexity they require a lot of connections that they need a lot of memory space, more than an average human can have.... the human explainer ...You seem to think the the human doing the explaining has more memory space than the student.
Quote from: Bored chemist on 25/07/2022 12:46:31But nobody would be so stupid as to design an antenna that way.The resistive losses are usually small compared to others.Oh, hang on I already told you that.That's because they cared, unlike you here.Quote from: Bored chemist on 24/07/2022 10:43:51Who cares?Why do they care?
thisQuote from: hamdani yusuf on 23/07/2022 04:54:12Electrons on a radio transmission antenna or a power distribution transformer may have high kinetic energy, but we don't usually say that they have high temperature.is still nonsense.
Quote from: Bored chemist on 25/07/2022 12:48:53Quote from: hamdani yusuf on 25/07/2022 12:38:50Although I realize that some concepts can have high complexity they require a lot of connections that they need a lot of memory space, more than an average human can have.... the human explainer ...You seem to think the the human doing the explaining has more memory space than the student.You seem to think that the words "some" and "average" are meaningless.
Use solid state laser.
QuoteIf you can't explain something to a first year student, then you haven't really understood it.Richard FeynmanAlthough I realize that some concepts can have high complexity they require a lot of connections that they need a lot of memory space, more than an average human can have. So, I'd like to replace the first year student with an AI which has adequate resources to cover the whole concept. It would be better if the AI also has natural language processing capability, so the communication with the human explainer can be free from unnecessary language barrier.