Photon Definition and 1000 Threads

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The energy of a photon depends on its wavelength, so theoretically when it is blueshifted it should have more energy right? Then what if a spaceship with a solar panel on the front is traveling towards the sun at relativistic speeds. An incoming photon undergoes a blueshift from the observer on...

I am studying Quantum Optics. A single photon state will give the mean photon number of 1, as shown the following equation: $$<\hat{n}>=<1|\hat{n}|1>=1.$$ For a two-photon number state, the similar calculation will be $$<\hat{n}>=<2|\hat{n}|2>=2.$$ And for a coherent state, it is...

Please see my attachment of a recent observation of light traveling through a medium. There is no source, just my observation The packets of light appear to be visible, distinct , moving at different speeds, and display the various colours for each wavelength. Is this normal / possible in a...

Homework Statement Consider interactions of a X-ray beam at a depth, x, within a material. The flux density is: density flux = $$\frac{I}{A}$$ where I is the intensity of the beam that cross a unit area A at right angles to the beam. Let dx be a small slice at the depth x and let dI(x) be the...

I recently re-read an article by Muller (https://arxiv.org/pdf/1606.07975.pdf) about the flow of time, and the possibility of time reversal given sufficient energy dissipation (basically during black hole evaporation, he concludes). Although the paper is on arXiv and not peer reviewed, Muller...

There are two polarization filters, A and B. Polarization filter A has angle of 0° and B has an angle of 30°. A photon is in superposition, so it doesn't have a definite polarization axis. The likelihood it's passing through a filter is depend on the difference between angle of the...

Perhaps this a question that make no sense or has no answer but... I understand an EM wave is not like the carrier of an AM station but rather similar to a Keyed Morse Code transmission. In other words bust of trains ow waves If my description is correct How long the burst last? How many...

Homework Statement The problem I am trying to solve is the proper time elapsed along A's worldline between a photon being emitted and sent to B (which is a distance L away from it along the x axis) and being reflected and detected by A again. The question is the second part of the question...

I've been told that when a photon of light is created it instantly achieves the speed of light without having to 'speed up". How is this possible?

Homework Statement I have been asked to calculate the momentum of a photon in that has been ejected as a gamma ray after a nucleus was excited in terms of the Energy. I am confused as to whether or not I can use two different equations Homework Equations E=mc^2 or E=hf λ=h/p The Attempt at a...

In quantum physics they say that the probability P for a photon to pass through the filter depends on the angle Φ between the photon and the filter polarization axis: P = cos^2(Φ) And if I'm not wrong, when the photon passes through that filter (like illustrated in the image above) the...

When a photon emitted by a distant quasar arrives, almost certainly has an energy less than 1.02 MeV. If it had a higher value, it likely would have decayed into particle pairs on its way to the Earth. Is this reasoning correct?

I've found this animation of an accelerated charge creating an electromagnetic wave: http://www.tapir.caltech.edu/~teviet/Waves/field_a.gif My question is regarding the perturbation I've encircled in green below: Is this what we call a photon?

The light source in the DCQE experiment of Kim et al is a laser which illuminates two slits which are immediately followed by an SPDC. The latter is therefore excited coherently in two narrow stripes referred to as "slits". The output has a small amplitude of down-converted entangled pairs. The...

[Moderator's note: This thread is spun off from a previous thread since it was getting into material too technical for the original thread. The quote at the top of this post is from the previous thread.] Field quantization doesn't require a photon picture. A measurement device that creates a...

How photon transfer energy to electron in case of photoelectric effect,and compton effect. Is any high level theory which explains this scenario?

Photons do not have mass, so why stop at 299700 km/s??

We're told that all electromagnetic radiation consists of photons. But you never hear them mentioned when discussing low-frequency radio waves. Why not? I get that, due to the low frequencies, the energy of each individual photon would be very small, so there must be lots and lots of them flying...

If I understand it correctly, the proper time differential for a photon in flat space is zero. That is evident if the velocity of light is equal to c, so the right hand side of the Minkowski metric is equal to zero. Therefore the left side must also be zero. My question: Is the same true for...

Wiki states: Photon upconversion (UC) is a process in which the sequential absorption of two or more photons leads to the emission of light at shorter wavelength than the excitation wavelength. https://en.wikipedia.org/wiki/Photon_upconversion Is it possible to have the emitted light with the...

<< Mentor Note -- thread moved from the technical forums, so no Homework Help Template is shown >> Let's say you have a laser cavity with two mirrors at either end, one is considered 100% reflective, the other 99.9%, so that a wave beam is emitted through this lower reflectivity mirror. I know...

Hi everyone, I have a few questions about the composition of light: First, what is it? Is white light the result of all color wavelengths present in an area? Second, if so, then why is there no interference in waves of light (or is there)? Third, if photons all travel at the same speed, then...