Photons Definition and 1000 Threads

If a quantum sistem can vibrate only in discreate energies, can there exist photons of all energies (All frequencies in the real number line)?

I was reading Feynman Diagrams and stumbled upon this query: If the electrons and protons interact by exchange of photons, does the electron inside an atoms also interact with the nucleus with a similar kind of exchange?

Hey! I have classes of physical chemistry (also had physics in high school) and have some misconceptions about how quantum mechanics work. The question I want to ask is: what's the difference between luminescence (fluorescence/phosphorescence) and (not sure about terminology here) concepts of...

Photon is the force carrier for charged particles. Questions: 1. Are photons generated between proton and electron in an atom? 2. If yes who generate the photon? The proton or the electron? 3. If yes, quantum mechanically, the electron is never at a fixed position, what is the photon doing...

Why are photons described by real field, while electrons by complex field?

I've read two articles about the historic development of the concept of photon and how some effects which originally were explained using photons have been later explained by other means. And after this two quick readings I have a lot of questions. First of all, do we really need a concept of...

Is the velocity of two photos of same radiation(light) with different energies same ?? (also in Same medium) Will energy alter the velocity of photon?

Homework Statement An excited hydrogen atom can emit photons of various wavelengths. a) What is the maximum wavelength of the Balmer series (in nm) (5pt) b) What is the minimum wavelength of the Balmer series (in nm) (5pt) c) Corresponding to part b), what is the kinetic energy of the recoil...

Is there a theory that explains the mechanism under which photons exceeds the speed of light? It should refer to cases including photons generated in an oscillating charges, dipoles, inhalations, different kind of excitation, accelerated particles, scattering phenomenons etc. Please note that...

Homework Statement [/B] An electron e- and positron e+ annihilate to produce two photons. a_ Why are two photons produced rather than one? b_ Assume that the e- and e+ are at rest just before they annihilate. In their rest frame, what are the energies and momenta of the photons? Define the +x...

What is the difference between two single-photon Fock states ##|1\rangle |1\rangle## and one two-photon Fock state ##|2\rangle## (all in the same mode)? In both cases the mean photon number is 2. How do we distinguish them experimentally?

This isn't really a homework question but I do have to know it for my lab report so I figure this is a good place to post it. So for my lab we had the setup that is displayed in the picture attachments. My question deals specifically with step #9 of the lab instructions. I'm assuming that the...

https://en.m.wikipedia.org/wiki/File:Moon_egret.jpg Can we use better telescopes of this type (ground based gamma rays telescopes) to image the surface and subsurface of a planet with a lot of resolution?

I need clarification on the difference between a virtual photon of a transmitted force and “radiated photons” of accelerated charges. Imagine two electric charges separated by a distance “d” but not moving. They exchange virtual photons which tell the electric charges to attract/repel. How are...

Can you pump enough low energy photons into a box that the rate of dissipation is overwhelmed and cause the box to explode?

this is the first time I am learning about photons and i have asmall doubt. if photons are massless then how come light dosent escape from black holes. or if they do have mass the by the eqn m=m0/(1-V2/c2)then theyll have infinite mass and turning on a torch may be like getting hit by a bullet...

Hi guys, I am looking for a formula which I am sure exits but I cannot locate it. The problem is that a quantum dot absorbs a photon of wavelength λ0(dot is semiconductor or could be any other material). Assuming that it reemits a photon, what is the probability that this emitted photon will...

imagine this situation: there's a very similar planet to Earth with almost the same atmosphere and surface. we want to know what lies beyond the surface to know if life exists there. so could we send or observe radio waves or microwaves with a similar telescope as arecibo that penetrates several...

Hi everyone, Apologies if this is common knowledge or a silly question, I'm just coming back to physics and I've been looking through the double slit experiments ( both double slit and delayed choice quantum eraser ) and it got me thinking about the uncertainty principle. With a photon of...

When two electrons approach each other, there is a repulsion between them by the exchange of a photon as the electromagnetic force carrier. Is there a general range of wavelength of such photons? Does it depend on how rapidly these electrons are approaching each other?

1. When an electron drops from one orbit to a lower orbit, it secretes a photon. 2. Any body with a temperature above absolute zero secretes black body radiation. Black body radiation can't possibly be caused by electrons dropping orbits, because there are only so many electron orbits, and...

I know when we see an object then the frequencies of photons reflected from the object carry the information about the colors. Frequencies of visible spectrum helps us to visualize colors. However which properties of photons help us to estimate distance,speed,size,width,height,depth, plainness...

I've been looking through the internet and I haven't found anything too clear on this: is it correct to assume a electrostatic interaction, say, between two stationary electrons as an exchange of virtual photons?

I am on Alpha 4 light years away from earth. On 1st Jan, 2016 I lit a powerful laser light towards Earth for 10 seconds and then switched it off. My friend on Earth knows that he has to detect that light after 4 years on the night of 1st Jan, 2020 from a space station using a very powerful...

I've seen, in the description of a black hole's photon sphere, a mention of a "light-like ds." I was happy to see it because I've been thinking about a photon's physical environment; at the speed of light, it would experience no radial dimension & no time dimension. Might it make more sense to...

Is it possible (and has it been observed) where a single high energy photon is emitted, but then is received as multiple lower energy photons?

The temperature of expanding Universe is cooler and cooler.The most contribution of energy of background photons(CMB) are of photons having energy ~3kT.Then where have the high energy background photons gone?

Hello! Let's consider again a system of atoms with only two permitted energy levels E_1 and E_2 > E_1. When electrons decay from E_2 level to E_1, they generate a photon of energy E_{21} = E_2 - E_1 = h \nu. The number of photons (per unit frequency, per unit volume) emitted by such a system in...

When protons, due to their electric charge, interact with photons are the quarks somehow also involved in this same electric interaction? After all, the quarks do have fractional electric charges. Thanks in advance.

When electrons produce photons in accelerators what is the mechanism called? and who was the first to do it?

I've been pre-occupied with Heisenberg's uncertainty principle for around four years now, and I've come to fabricate a lot of questions. The most pressing one, however, is as follows: To me, the uncertainty principle seems to reference our (relatively) poorly controlled methods to measure a...

I've heard of photons being described as a wave/particle duality. But what evidence is there that individual photons behave like anything other than a particle? I can see how photons en masse can display wave/particle characteristics, but what evidence is there that any individual photon...

Is the "missing mass" the mass of the photons connected to and neighboring the matter which are displaced by the matter?

Homework Statement The average wavelength that LED emits is 500nm. The electrical power of the LED is 300mW and the efficiency of turning energy into light is 66%. Number of emitted photons in unit time is? Homework Equations ##E_f=hcf## ##\frac{Pt}{E_f}=number of photons## The Attempt at a...

I mean, look this stupidity: [Mentor's note - link to crackpot site deleted] This guy denies that light photons exist, and that we are 'magically creating it' like cyclops X-Men This is worst than flat-earthers, I wonder If there is some evidence or is it unfalsifiable, like solipsism? Because I...

I know that magnetic fields create moving charges (an electric current) normal to the plane of the magnetic force lines. I also have heard that magnetic and electric fields create each other in a perpendicular direction to the other (badly worded). Electric currents are moving charges (usually...

This question is a new (to me) wrinkle on the old Special Relativity spaceship pseudo-paradox gedankens. Suppose you observe two spaceships motionless relative to you, side-by-side a mile apart. First, a rifle is fired from one at a target on the other, the bullet hits the target. Now they...

(correct me if I'm wrong; When new bonds form in the process of combustion, the energy being released is given as kinetic energy to the molecules (heat) and the kinetic energy is (somehow) absorbed by electrons to reach and excited state, eventually dropping down again and releasing photons of...

This paper https://physics.aps.org/featured-article-pdf/10.1103/PhysRevLett.111.240402 was discussed briefly in another thread on Klyshko photons. I have a couple of questions to anyone who has studied the work. The authors themselves note that "...even Maxwell’s equations for the classical...

e few days ago i talked with my teacher about the energy in the universe being constant. but we were completely confused when we came to the concept of: "because of the universe expansion everything moves away from each other. and the same goes for the wavelenghts in light. because of the way...

As I understand a photon has zero rest mass (as far as we can tell) but it does have a passive gravitational mass in order for it to be able to respond to gravity. But I've been shown that passive gravitational mass should be equal to active gravitational mass, and if this is true and photons...

I am not a physicist but have heard that photons from the sun effect the flight path of asteroids? I was just wondering if these same photons would ever be able to effect nearby star systems? Therefore could there be a slight push between star-systems pushing them further apart? (Does this come...

Following scenario: One million entangled photon pairs are created and are sent to Alice's and Bob's laboratory such that Alice receives 1 million photons(or any other large number) of which each is entangled to one of the million photons Bob receives, their laboratories being at a distance to...

I am really not sure. I watch Susskind lecture But I am still confused. He sad electron in motion emits photons. Quarks in motion emited gluons. Is that correct? Could quark be in motion? Also why all matter is made on fermions? And does Higgs gave mass to all particles? Why photon after all...

How can we detect photons without mass ? In the experiment that was showing two photons hitting the detector when only 1 was fired through the slit, how did technology detect photons without mass to hit the detector ?

My understanding is that the path of a photon between any two points A and B can be worked out by finding the route which will get it there in the least time. This seems to be true both when a photon passes near a heavy mass and deviates because of gravity (as predicted by general relativity)...

Hi folks, IMO, it should be possible to initiate a nuclear fusion of H1-H2 and H2-H2 in crystals of Lithium Hydride induced by gamma photons emitted form decay of Na24. Could anyone please verify if the following is correct? By using nuclear photodisintegration effect, we need a gamma photon...

How are the photons in a monochromatic beam of orange light (for example) different from the photons in a monochromatic beam of green light? I'm trying to understand the properties of individual photons. -- Jeff, in Minneapolis

The second postulate of SR is telling us that light always travels at C in a vacuum(absent of gravity) measured by any observer independent of the source or inertial frame the observer is measuring the light from. However, light is made up of photons which do not travel like ping pong balls in...

If photons are part of a magnetic field like electrons, which electrons can be read with an amp meter, what can measure or count photons? Electrons are not counted but the magnetic field changes when more current flows and the ammeter reads a change in the magnetic field. What type of light are...