Linked Questions

13
votes
4answers
2k views

How to rebut denials of the existence of photons? [duplicate]

Recently I have encountered several engineers who do not “believe in” photons. They believe experiments such as the photoelectric effect can be explained with classical EM fields + quantized energy ...
0
votes
1answer
294 views

Photoelectric effect and photons: what suggests a particle nature if we only measure resulting current? [duplicate]

I'm fairly noobish over here, but delving into the details of the major experiments. The particle nature of a photon has me stumped though. So hopefully there is already an explanation to this I have ...
37
votes
6answers
10k views

Does a photon interfere only with itself?

I sometimes hear statements like: Quantum-mechanically, an interference pattern occurs due to quantum interference of the wavefunction of a photon. The wavefunction of a single photon only ...
20
votes
4answers
7k views

Are the Maxwell equations a correct description of the wave character of photons?

In basic quantum mechanics courses, one describes the evolution of quantum mechanics chronologically. Interference experiments with particles showed that particles should have a wave character; on the ...
8
votes
5answers
35k views

What is the relation between photoelectric current and frequency of incident light?

I googled it a bit and found that photoelectric current is independent of frequency(of incident light). Some further look revealed that actually "saturation current" is independent of frequency.I ...
3
votes
2answers
12k views

Photoelectric effect as proof of the particle-like nature of photons

Why is the photoelectric effect cited as an example of a particle-like nature of photons? The photon's not physically knocking off the electron, right? It's supplying energy to break the bond, hence ...
11
votes
2answers
5k views

Do photons have relativistic mass?

I am conducting research on photons and was wondering if they have relativistic mass. I already know that they they have zero rest mass. Any answers are welcome!
12
votes
4answers
924 views

Can people create single photon in the laboratory?

Can a single photon be created in the laboratory? How do people make sure that they have really created a single photon?
12
votes
3answers
2k views

DIY Quantum Eraser Experiment by the Scientific American: Is this really quantum?

Click here for the publication. Having performed this experiment, I have gotten clean results. Essentially, a double slit is made by putting an photon beam in the way of a wire with orthogonal ...
9
votes
3answers
611 views

Can entanglement be explained as a consequence of conservation laws?

This article at NewScientist magazine (subscription required) describes entangling photons by passing them through a half silvered mirror. http://www.newscientist.com/article/mg21929282.100-quantum-...
2
votes
3answers
7k views

Why wave theory cannot explain photoelectric effect and provides evidence for particle nature of light?

I am able to understand how light can be modeled to have wave characteristics from Young's double slit experiment. But I am unable to comprehend how we can understand light to have particle ...
4
votes
1answer
777 views

Classical (or semi-classical) interpretation of photoelectric effect?

This site says that "it has recently been proven that the photoelectric effect can be interpreted classically (or at least semi-classically) in non-particle, wavelike terms". Is anyone familiar with ...
0
votes
1answer
2k views

classical physics and photoelectric effect

Why did classical physics failed to explain the fact that in photoelectric effect, there is a threshold frequency value below which the effect does not occur? I not sure if my answer actually ...
5
votes
3answers
249 views

Which particle aspect is required to explain photoelectric or Compton effect?

What do we mean when we say that it requires the particle nature of radiation i.e., photons, to explain photoelectric or Compton effect? I don't understand which particle nature is used to explain ...
7
votes
2answers
303 views

Examples of “pseudo quantum effects” in history of physics

Are there any examples in the history of physics where a phenomenon was considered by the physics community to be not explainable by classical physics and needed a quantum explanation whereas some ...
0
votes
1answer
383 views

Light behaves as a particle or wave in this thought experiment?

Consider a metal plate, on which a light of appropriate wavelength is incident such that it creates an interference pattern. The wavelength is chosen such that it can cause detectable photo-electric ...
5
votes
2answers
365 views

Is a purely classical description of lasers possible?

Laser action is usually described in terms of photons and stimulated emission. In 1972, Borenstein and Lamb published a paper* claiming that lasers can be described classically on the basis of ...
5
votes
1answer
104 views

Why not use this experiment to test gravity's quantum properties?

If a heavy object $X$ is in superposition, let's say, at two places "at the same time", to which point is the gravitational pull of that object directed to? This can probably not be answered without ...
0
votes
1answer
386 views

Why do electrons eject only if the frequency of incident ray is greater than the threshold frequency? [closed]

Why do the electrons start moving even if the dim light (less intense) of a specific frequency falls on the material ?
0
votes
3answers
192 views

How energy of a photon or EM wave has something to do with frequency?

While I was thinking what exactly meant by energy in quantum mechanics, I was quite shocked by the fact that it is proportional to frequency. $$E=hf$$ Given the fundamental definition of energy in ...
1
vote
2answers
107 views

Wave-like description of Compton scattering and photoelectric effect

I have found in the wikipedia page for QFT the following statement: ... Although the photoelectric effect and Compton scattering strongly suggest the existence of the photon, it is now understood ...
0
votes
1answer
93 views

How does photoelectric effect prove that light is also a particle?

I was watching this experiment (https://www.youtube.com/watch?v=v-1zjdUTu0o) which demonstrates the photoelectric effect, but it does not make any sense to me how it proves light as a particle instead ...
0
votes
1answer
54 views

Quantization and wave-particle dualism of light

I'm studying atomic spectras and got puzzled about light-quantization. I'll expose my effort to understand it so far. Blackbody radiation Around the year $1900$ Planck explained blackbody radiation ...