All Questions
60
questions
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49
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Why does radiation of small wavelength interact with small objects?
I was reading chapter 2 from the book 'Diagnostic Radiology Physics : A handbook for Students and Teachers', and came across the following quote
"X rays of energy of a few tens of ...
- 273
1
vote
1
answer
87
views
What is light? how is it connected to electromagnetic radiation?
I am trying to understand how light works and electromagnetic radiation, from what I understand charges cause disturbances in electric fields, which triggers a magnetic field, and then the back and ...
3
votes
2
answers
124
views
Are EM waves telling us the probability of finding a photon?
I feel like I've been frequently presented with an interpretation of EM waves that goes something like this:
Light is an oscillating electromagnetic field. Because changes in the electric field ...
- 203
0
votes
0
answers
27
views
How do the forces involved in EMR continue to occilate past emmision of a photon
If electric fields are created by an accelerated charged particle, such as an electron, and magnetic fields are generated by electric fields in motion, what are the individual fields that make up ...
2
votes
0
answers
46
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Does a plasma with plasma frequency $\omega_p$ generate photons of the same frequency?
I know that photon emission in plasma results in a change of energy level of the electrons from excited or ionised atoms. However, I saw that photons of 13eV were created in a helium plasma, but this ...
- 21
0
votes
1
answer
166
views
De Broglie wavelength of a photon
The de Broglie wavelength of a photon and the wavelength of its corresponding electromagnetic wave are numerically the same. Is this just a coincidence and the two waves are different or is the de ...
- 128
0
votes
1
answer
80
views
Virtual photons and slowing down longitudinal wave propagation
It is often described, that virtual photons are mere mathematical constructs, that can turn to real photons if there is enough time and space. And also, that virtual photons can mediate longitudinal ...
- 1
1
vote
1
answer
112
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Is this an example of a spatially coherent wave?
My ultimate goal is to understand why the spatial coherence of a wave increases with distance from the wave source. From what I have read though, there seems to be conflicting definitions of spatial ...
- 1,581
2
votes
1
answer
178
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Time delay between consecutive photon absorptions by atoms/molecules?
We are just getting introduced to some basics of quantum physics at school and in my nationally prescribed school book, its written that:
Planck assumed that radiation could be subdivided into ...
- 1,168
1
vote
1
answer
283
views
Are the photons in a standing wave moving at $c$?
So, in a standing wave, two superimposed waves produce a wave that remains stationary, with its particles resonating back and forth, right? For instance, in a water wave, two waves moving in opposite ...
- 1,309
0
votes
0
answers
56
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What's the distance required for an omnidirectional wave of light of the highest possible amplitude to reach the lowest possibly measurable amplitude?
I'm interested in finding the distance it takes a single omnidirectional pulse of light of a given wavelength under ideal conditions to spread out from the highest possible amplitude to the lowest ...
0
votes
0
answers
47
views
Electromagnetic wave function of a photon
I wanted to find the electromagnetic wave function of a photon, or at least what it might be. An interesting thing about photons is no matter how far they travel, their field stays concentrated ...
- 780
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1
answer
32
views
What's the track it will be for light?
Let's suppose one shaking light starts from Proxima Centauri and travels toward the earth. We know light will travel from more 4 years to reach the earth. It will be interesting if we 'look' at the ...
- 23
1
vote
3
answers
188
views
Why move photons straight ahead and do not move wave like?
A single photon can be seen as a wave. Normally, waves move in all direction. So one could expect a photon to form a spherical wave. But a photon moves straight on, only in one direction.
Is there any ...
- 120
2
votes
1
answer
225
views
Instantaneous ejection of photoelectrons indicative of particle nature of light?
My physics textbook under a section explaining about How wave nature of light does not explain Photoelectric effect, mentions the following:
No matter how small is the intensity, photoelectrons are ...
- 133