Linked Questions

2
votes
2answers
465 views

Is my visualization of a photon correct? [duplicate]

When trying to visualize a photon, I imagine it as an electromagnetic wave of very short length. Is this accurate?
2
votes
4answers
161 views

If light is considered a wave, then what exactly is a photon? [duplicate]

So according to google: a photon is a particle that transmits light. Ok, but light is considered a wave, not a stream of particles(I'm pretty sure that this is what Young's double slit ...
2
votes
1answer
205 views

How do photons travel? Do they have a specific shape? [duplicate]

Generally photons are EM waves (2-axis i.e, 2 dimensions); from that we can imagine a photon basically travels in a cyclic wave pattern. If we go into higher dimensions, will they trace a spiral path ...
2
votes
1answer
58 views

The Dual Nature of Dual Nature [duplicate]

When we say that light behaves as a particle and as a wave, we say that light is an electromagnetic wave, and it's a photon. Both EM waves and photons have physical definition. On the contrary an ...
0
votes
0answers
32 views

Photons. What are they? [duplicate]

Photons are described as packets of energy and photon with a frequency has mass, momentum and kinetic energy. If they are particles, how can they have frequency? If they are waves with a frequency, ...
190
votes
8answers
241k views

If photons have no mass, how can they have momentum?

As an explanation of why a large gravitational field (such as a black hole) can bend light, I have heard that light has momentum. This is given as a solution to the problem of only massive objects ...
83
votes
6answers
13k views

What is more fundamental, fields or particles?

My confusion about quantum theory is twofold: I lack an adequate understanding of how the mathematics of quantum theory is supposed to correspond to phenomena in the physical world I still have an ...
40
votes
3answers
10k views

Why do the neutrinos (with mass) from a supernova arrive before the light (no mass)?

I've already read the below questions (and their answers) regarding neutrinos vs. electromagnetic waves propagating through space, but I'm still not clear on something. Neutrinos arrived before the ...
42
votes
4answers
13k views

Do virtual particles actually physically exist?

I have heard virtual particles pop in and out of existence all the time, most notable being the pairs that pop out beside black holes and while one gets pulled away. But wouldn't this actually violate ...
35
votes
7answers
2k views

Do Maxwell's equation describe a single photon or an infinite number of photons?

The paper Gloge, Marcuse 1969: Formal Quantum Theory of Light Rays starts with the sentence Maxwell's theory can be considered as the quantum theory of a single photon and geometrical optics as ...
44
votes
4answers
18k views

What is a phonon?

I am trying to understand intuitively what a phonon is, but for the moment I find it quite difficult (having a limited background in quantum mechanics, an undergraduate course in non-relativistic QM). ...
28
votes
2answers
7k views

The concept of particle in QFT

I never learnt QFT and I apologize for my (probably) elementary question. Somebody told me that in QFT a particle is viewed as an irregularity in the field. On the other hand, in an article in ...
27
votes
4answers
32k views

What exactly is a quantum of light?

I am currently trying to learn some basic quantum mechanics and I am a bit confused. Wikipedia defines a photon as a quantum of light, which it further explains as some kind of a wave-packet. What ...
10
votes
5answers
3k views

How does gamma-gamma pair production really work?

See the Breit-Wheeler process, wherein two gamma photons are converted into an electron and a positron via a process that's the reverse of electron-positron annihilation. I do not doubt this process. ...
6
votes
6answers
3k views

What do photons look like?

We have many theories that advocate the particle nature of light. But have we ever observed photons physically? If so: what do they look like? How big are they? If not: why not? Is it because they ...

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