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Great. Could you please provide a link to one of these experiments?
wavelength of EM waves determines their size of influence in space.
Quote from: hamdani yusuf on 27/03/2024 13:05:24wavelength of EM waves determines their size of influence in space.No. Astronomers measure pretty much the entire spectrum from ULF (10 Hz or so) to GeV gamma radiation, all coming from umpteen billion light years away.
Quote from: hamdani yusuf on 27/03/2024 13:05:24But experiments clearly show that wavelength of EM waves determines their size of influence in space.Great. Could you please provide a link to one of these experiments?
But experiments clearly show that wavelength of EM waves determines their size of influence in space.
in video#7 we try to determine the size of photon, which is thought to be the quantum of light and all other forms of electromagnetic radiation, including microwave. We use two metal plates to create a single slit with adjustable width. //www.youtube.com/watch?v=VNjYx0Il_MU
Determination of "photon size" is continued in video#8, using multiple slit//www.youtube.com/watch?v=_17rbWTig30Spoiler: showSpoiler alert :From the experiments shown in this video, it is clear that photon model is not the best way to describe microwave interaction with electrically conductive materials. We need a better model based on following facts:- Microwave can still pass through even when its transmission path is almost entirely covered by metal sheet. (This is found when the metal sheet is restricted so it cannot produce opposing electrical oscillation that cancel out the transmitted wave.)- Microwave can be completely blocked even when there are much space uncovered by conductor. (This is found when there are adequate conductors to produce opposing electrical oscillation that cancel out the transmitted wave.)- Maximum transmission is achieved when the Gunn diode in the transmitter is aligned with the Schottky diode in the receiver, if there is no obstacle between them.
I have uploaded a new video trying to show the blocking mechanism of microwave by various arrangements of conducting material. Those arrangements are modified versions of microwave polarizer used in previous videos.//www.youtube.com/watch?v=tLGQ29kz5NkSpoiler: showIt shows that the same amount of conductor can have different effectiveness in blocking microwave. The result may seem counterintuitive, where an arrangement which have large gaps can be a more effective blocker than another arrangement which is more evenly spread, even though they have the same amount of conductor.Due to its length, I'll upload my effort to explain the result in another videos, so stay tuned.
And my explanation for the result we get in previous video is shown here//www.youtube.com/watch?v=Tky8BwMyUWQSpoiler: showThe video explains that an obstruction blocks microwave propagation by generating reactive wave with reversed polarity to the original one. The original wave is canceled due to destructive interference.The explanation is based on antenna theory.
Here is the supporting evidence for the explanation given in previous video about microwave blocking mechanism using a model of antenna as receiver and transmitter at once, and followed by superposition principle.//www.youtube.com/watch?v=uja1rmRTLwo
No problem, just look at the door on any microwave oven, a fine grating or mesh is provided. Usually the mesh is much smaller than the microwave radiation that is being shielded or about 1mm in size is normal as compared to the 12 cm size microwave.
You should understand that I referred to transversal size, not length. Why microwave is trapped inside microwave oven, while visible light can escape through the metal mesh?
Photons, unlike most objects, don't have a well-defined size in the way a marble or a car does. They behave differently depending on the situation. Here's how we think about it:Point-like: In some interactions, photons seem to act like point-like particles. They can be absorbed or emitted entirely by tiny targets, even smaller than an atom's nucleus.Wavelength-related size: From a wave perspective, a photon's "size" is related to its wavelength. The wavelength is the distance between peaks in the wave. We can talk about a photon's "effective size" based on its wavelength, but it's not a physical size in the same way a marble is big.It's important to note that photons are force carriers, not little balls of light. They carry energy and momentum, but their existence is more about the electromagnetic field than a physical object.
Here are a couple of research papers you can look into regarding the size and shape of a photon:Electromagnetic fields, size, and copy of a single photon arXiv: arxiv.org:1604.03869 explores the concept of a photon's shape depending on its energy. It delves into how a photon might resemble a thin stick or a plate based on specific conditions.The Size and Shape of a Single Photon Scientific Research Publishing: www.scirp.org/journal/paperinformation?paperid=10928 discusses the concept of effective size based on wavelength and the limitations of assigning a strict size to a photon.
When we talk about a photon, we specify a frequency/wavelength and direction and position, but its physical size is typically not mentioned. It is the atom or molecule that sets the cross-section for a photon interaction not the photon itself. Given this gap in the physics of photons, we have explored here the question of the size/width of a photon perpendicular to its direction of propagation?defined as the size of a hole that will pass the photon with at least 90% probability.
When asked about the size of photons, Gemini answered:
Electromagnetic fields, size, and copy of a single photon arXiv: arxiv.org:1604.03869 explores the concept of a photon's shape depending on its energy. It delves into how a photon might resemble a thin stick or a plate based on specific conditions.
Photons are almost involved in each field of science and daily life of everyone. However, there are still some fundamental and puzzling questions such as what a photon is.The expressions of electromagnetic fields of a photon are here proposed. On the basis of the present expressions, we calculate the energy, momentum, and spin angular momentum of a photon, derive the relations between the photon size and wavelength, and reveal the differences between a photon and its copy. The results show that the present expressions properly describe the particle characteristics of a photon; the length of a photon is half of the wavelength, and the radius is proportional to square root of the wavelength; a photon can ionize a hydrogen atom at the ground state only if its radius is less than the Bohr radius; a photon and its copy have the phase difference of {\pi} and constitute a phase-entangled photon pair; the phase-entangled n-photon train results from the sequential stimulated emissions and belongs to the Fock state. A laser beam is an ensemble of the n-photon trains and belongs to the coherent state. The threshold power of a laser is equal to the power of the n-photon train. These provide a bridge between the wave theory of light and quantum optics and will further advance research and application of the related fields.https://arxiv.org/abs/1604.03869
This video is actually not about photon size but about coherence length. In this video I discuss the behavior of electromagnetic radiation, especially the aspect of interference. The experiment shows that there is no such thing as individual photons in EM radiation. The photon only exists as an energy exchange between radiation and matter.0:00 General Intro0:47 What do others say?1:21 About wavelength and size2:10 Interference in light3:08 Electromagnetic waves and detection5:25 Things that make you go Hmmm...7:36 New experiment and setup10:23 Calculation of single photon level (boring)11:59 Result of the new experiment12:41 Discussion of the result16:29 About "shot noise"17:16 EM field strength and probability of detection19:18 So how big is it then?20:02 Deleted sceneAt 3:08 the Electric and Magnetic field components have been swapped accidentally.
The experiment shows that there is no such thing as individual photons in EM radiation.
Why microwave is trapped inside microwave oven, while visible light can escape through the metal mesh?
On the basis of the present expressions, we calculate the energy, momentum, and spin angular momentum of a photon, derive the relations between the photon size and wavelength, and reveal the differences between a photon and its copy. On the basis of the present expressions, we calculate the energy, momentum, and spin angular momentum of a photon, derive the relations between the photon size and wavelength, and reveal the differences between a photon and its copy.
the length of a photon is half of the wavelength, and the radius is proportional to square root of the wavelength; a photon can ionize a hydrogen atom at the ground state only if its radius is less than the Bohr radius; a photon and its copy have the phase difference of {\pi} and constitute a phase-entangled photon pair;
Quote from: hamdani yusuf on 28/03/2024 14:14:25The experiment shows that there is no such thing as individual photons in EM radiation. And yet we can count them!
Quote from: hamdani yusuf on 28/03/2024 10:32:16Why microwave is trapped inside microwave oven, while visible light can escape through the metal mesh?Wavelength. I am sure some idiot will point out that mice can escape through the bars of an elephant's cage because they are smaller, but mammals cannot self-propagate in a vacuum because they are not electromagnetic radiation. Beware of false analogies. If it stinks, it is probably philosophy, not science.
This means that, in a sense, it doesn't ″experience″ its own motion.
Obviously, Maxwell′s equations do not explain everything in a conclusive manner, for if they did there would be no need for quantum mechanics to introduce all these stages.
How do you count them?