All Questions
28
questions
-1
votes
2
answers
152
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Max Planck - what does 'per wavelength' mean?
Planck says
$$B_\nu(T)=\frac{2hc^2}{λ^5}\,\frac{1}{\mathrm{e}^{hc/λk_BT}-1}.$$
It's defined as energy emitted per unit volume per wavelength. I'm not sure if this includes per solid angle, but I ...
- 200
0
votes
1
answer
110
views
Max Planck - what's the $B$?
Planck says
$$B_\nu(T)=\frac{2\nu^2}{c^2}\,\frac{h\nu}{\mathrm{e}^{h\nu/k_BT}-1}.$$
It is power emitted per unit area per unit angle per unit frequency. This is what I'm curious now.
Let's say we ...
- 200
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
2
votes
5
answers
475
views
Is a photon a single wavelength of monochromatic light?
I am confused about all these different interpretations of what a photon is?
I am looking for a simple and practical interpretation.
Therefore, I am asking herein if a single photon corresponds to a ...
- 4,170
1
vote
0
answers
76
views
Is the distance between photons the wavelength of light? [closed]
I have a question that may be naive for you, but I would like you to answer it
The question
Is the distance between photons the wavelength of light?
1
vote
2
answers
354
views
Are gamma rays the limit of the frequency photons can attain, and if yes, why? [duplicate]
Recalling that the Planck constant is $6.62607015 \times 10^{-34} m^2kg/s$ and taking into account the formula $E=hf$, for the energy of photons, we can rapidly derive the energy of gamma rays, which ...
- 143
-2
votes
3
answers
171
views
Length and width of photon - check logic
so if $E = h\nu = \frac{h c}{\lambda} = pc$ where $\lambda$ is the photon's wavelength, $h$ is planck's constant, and $p$ is the photon's momentum
and
$L = \frac{p}{h}$ where L is length and p is the ...
- 5
1
vote
0
answers
66
views
Upper limit of energy carried by one photon [duplicate]
energy carried by one photon, $E = hυ$ where $υ$ is frequency and $h =$ planck constant. Is there any upper limit to how much energy one photon can carry? or any upper limit of frequency?
- 67
6
votes
1
answer
2k
views
Does a single photon have a wavelength or not? [duplicate]
I have read this question where anna v says:
The photon is an elementary particle in the standard model of particle physics. It does not have a wavelength.
What exactly is meant by the wavelength of ...
- 29k
20
votes
3
answers
3k
views
Is it possible to confine a photon in less than its* wavelength?
*(Its, or associated. That is somehow the question).
I can think of, at least in principle, a perfectly reflecting optical cavity with dimension comparable to the wavelength of the electromagnetic ...
- 1,729
0
votes
0
answers
147
views
Does quantum mechanics mean that there are a finite number of colours? [duplicate]
Forgive me if my reasoning is based on flawed logic and information. I am no physics expert.
As I understand it when light strikes an object the energy of the photons is absorbed by the atoms that ...
- 49
-3
votes
3
answers
114
views
Why is there a concept of photons? Isn't it just EM waves at a certain wavelength?
Visible light is simply part of the EM spectrum at certain wavelengths.
I assume UV and infrared don't even qualify as "photons".
So why do we have this concept of a photon when all it is, is a ...
- 103
0
votes
3
answers
120
views
Energy levels of electrons in an arbitrary element?
Let's say I want to calculate the wavelength of the photon emitted when an electron of an arbitrary element (let's say Carbon) drops from $n=4$ to $n=3$.
Correct me if I'm wrong, but I think I would ...
- 113
2
votes
2
answers
401
views
Hypothetical maximum energy of a single photon [duplicate]
I'm no physicist so it might be a stupid question but is there a maximum energy a single photon can have?
My idea was, that there might be restriction for the minimum wavelength and I thought about ...
- 121
3
votes
2
answers
541
views
Do photons exist at all possible wavelengths? [duplicate]
My question refers to Photon flux spectrum diagrams.
The diagram shows the number of photons at different wavelengths. My question is whether the graph is granular or continuous. Do photons exist at ...
- 227