MQ + X = 2C Thanks John. Now, let's take a closer look.
<In the case of an antenna, the photon does not get absorbed there. The antenna acts as a scoop, diverting the photon down the antenna feed cable to the receiver where it is absorbed ... somewhere in the resistance (electric friction) of the electrical circuits.>
That doesn't seem right because photons don't travel in metal. I thought what happens is that the photons absorbed in the aerial make the electrons which do the absorbing get a bit overly excited and start surging up and down, bumping into each other causing a chain reaction down to the friction zone you mentioned.
<The antenna (aerial) does not need to be the right length, its just more efficient when it is resonaant>
Being curious, a year or so ago I cut up bits of stuff into different lengths and diameters, banana, chives, carrots and stuff, to find out how they absorb microwaves in our microwave oven. Sure enough, there were hotspots about 2.5cm apart if I remember rightly. Things smaller than that didn't get very warm. Ants seem to run around with impunity. I hear that cats don't do too well, so I let the cat have the day off and assumed that they do actually absorb microwaves and get hot. They would probably absorb them uniformly because they'd move around quite a lot and circulating blood and lymph would distribute heat.
So I expect that the wrong-sized aerial will make a very dramatic difference to absorption of signal in a cellphone.
But I don't buy the photon turning left and heading down the aerial to the friction zone.
Now, back to the water absorbing the photons: <This vibration of a polarised molecule then in turn re-radiates the photon and it carries on its journey. This process slows down the passage of the photon. >
How does vibration re-radiate a photon? Isn't it an electron which has got itself into an excessively excited state and which has gone up a level [a quanta or two] and then re-radiates on dropping back to base? I realize the absorbing electron is not predictable, but I just wanted to know whether it was an electron or the whole molecule of the whole puddle which does the absorbing.
The whole puddle must be involved because an ant just doesn't care and that is a very big puddle compared with a photon or a few million bouncing molecules of water.
So, somehow the damn photon knows that there is a puddle around and so it's okay to stop at a particular electron or maybe a whole water molecule. But if the water molecules are in vapour form, the photons aren't interested.
What about that 'slowing down' effect? How about light always travels at the same speed? But presumably not in water while the brakes are going on due to the water molecules getting excited. Imagine how slowly light must travel inside black holes if it slows that much just in water. Getting across town in a subway inside a black hole must take forever.
I guess I should ask Google and do some revision and learn just what goes on. But it's more fun just to ask somebody. My decades old physics book probably has it all there.
Mqurice
PS: Me trying to figure this out must look to registered physicists like an ant running around in a CDMA microwave trying to absorb phragmented photons while solving some of those Calabi Yau equations. |
