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My answer to the question is first a question. How do you photograph a photon? You can measure a photon by detecting it's presence on photographic film, or by using some sort of photomultiplier and digital detector, or by a handful of other ways. My point is that these all require the photon to be absorbed by the detector, thus they must be localized, and ...

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An infinite de Broglie wavelength isn't completely ridiculous. Indeed, what the de Broglie relation does is connect a wavelength to a particle of definite momentum-- and if the momentum is definitely zero, then the wavelength is infinite. In other words, the probability wave does not have any perceptible change with position, hence the location of the ...

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The pattern on the screen depends on where before the slit you measure the particles. If you measure the particle's position in a way, that it will propagate on in a way that will cover both slits later on, then you will just see the interference pattern as before. If you measure directly before the slits, the results will be (almost) the same as when ...

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We all know that if you shoot a single particle at the slits, the probability distribution that you will find on the screen after multiple trials will be that associated with a wave-like entity (interference pattern). Yes, you see a parttern like this one, courtesy of Brown University: Note though that each photon has energy E=hf or E=hc/λ. It has a ...

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I believe that the photons of EMR "escape" the source of them (excited electrons), whereas somehow the photons in a magnetic field just circle around.

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I think that your teacher (?) asked you about thermal de Broglie wavelength, where $$\lambda_T \propto\frac{1}{\sqrt{T}}.$$ You get this expression when you express the momentum in $\lambda=h/p$ in in terms of kinetic energy and the kinetic energy itself in terms of the energy due to temperature. (The derivation is also in the wikipedia article...) Indeed, ...

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On the screen you will detect particles always. But they won't form fringes, when you disturb them. If you do this before the slits edges, the result of seeing fringes or not depends from the result of your disturbance. For example, if you broaden the light beam, you are working against your apparatus which contains a collimator or a point-like light source. ...

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Is light a particle which has a electromagnetic field around it OR does the particle itself travels in a wave like motion? The latter. Light consists of electromagnetic waves which have a quantum nature, wherein we say the photon is a quantum of light. This tends to get converted into a "particle" of light wherein people think of the photon as some ...

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Is light a particle which has a electromagnetic field around it OR does the particle itself travels in a wave like motion? This depends of what you want to calculate. For atomic processes one use QED and photons are disturbances in EM field existing everywhere. But really one calculate processes in atomic and subatomic dimensions. If one want to ...

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