Questions tagged [wavelength]
The wavelength of a sinusoidal wave is the spatial period of the wave—the distance over which the wave's shape repeats, and the inverse of the spatial frequency or wavenumber. Determined by considering the distance between consecutive corresponding points of the same phase, such as crests. Use for wavenumber, wavelength, frequency.
1,017
questions
0
votes
0
answers
14
views
Why do we take vrms speed in de broglie wavelength not average speed for a gas
While solving many questions, I came across many solutions where we took v as vrms speed for de broglie wavelength of a gas but why can't we take v as average speed as it would give us average ...
- 45
0
votes
1
answer
44
views
What is the frequency of a standing wave? [closed]
I understand that constructive interference of waves results in standing waves. And for a wire with both ends fixed the frequency should match the fundamental frequency of the wire to produce standing ...
6
votes
4
answers
2k
views
Does glass convert light wavelength?
I heard that when sunlight enters house through windows, it gets converted into longer wavelengths and gets trapped inside.
So does the glass have anything to do with this or is this about heated ...
- 506
1
vote
3
answers
104
views
What is a laser spectrum?
What is a laser spectrum? How many wavelengths can we see in it, and why?
For a regular laser, the red ones you can buy at the store, is there just one red wavelength in the laser? Or are there ...
8
votes
4
answers
2k
views
How can photons interact with nuclei?
How can photons such as X-rays or gamma rays interact with the nuclei of atoms given that, as I understand it, the length scale of a nucleus is around a couple of femtometers? So, shouldn’t the size ...
0
votes
1
answer
49
views
What is the mathematical support for the formula $f_n = n f_1$, used to calculate the frequency of a standing wave? [closed]
could someone explain to me the mathematical support for the formula $f_n = n f_1$. This formula refers to the fact that the frequency of a standing wave is equal to the number of antinodes times the ...
- 51.2k
15
votes
7
answers
2k
views
Why does the length of an antenna matter when electromagnetic waves propagate perpendicular to the antenna?
The optimum length for a dipole antenna is a multiple of half the wavelength that it is designed to receive or emit. Why is this? If an electromagnetic wave has E in the x-axis, B in the y-axis, and ...
- 14.4k
0
votes
1
answer
239
views
Do even modes exist for e.g. pipes closed at one end?
This is really a question about terminology, The wavelength of a standing wave in a e.g. pipe closed at one end and open at the other is said to be $\frac{4L}{n}$, where $L$ is its length and $n$ is ...
CommunityBot
- 1
2
votes
1
answer
71
views
At which wavelengths do photons behave like X-ray?
Hard X-rays of wavelengths of about an angstrom are very different than regular lights in a way that they can’t be reflected or refracted, which means their refractive index is always close to 1 ...
- 95.5k
0
votes
1
answer
41
views
Understanding Loop Formation in a Plucked String
I have a question regarding the formation of loops when a string is plucked at different fractional lengths.
In a book I referenced, it is stated that plucking a string at 1/6 of its length produces 3 ...
- 2,496
1
vote
1
answer
2k
views
How does a longer wavelength penetrate deeper with Rayleigh waves?
I'm struggling slightly to understand this idea. I've slowly been building up an explanation, so at this stage it might be just some confirmation I'm looking for, but also some guidance if I'm off ...
CommunityBot
- 1
11
votes
4
answers
2k
views
Can the laser light, in principle, take any wavelength in the EM spectrum?
Can the laser light, in principle, take any wavelength in the EM spectrum? I don't think there is what prevent this in principle, right?
- 160
1
vote
1
answer
117
views
Pound-Rebka Experiment
Does anyone know if the velocity of the photons changes in the Pound-Rebka experiment?
Do the wavelength and the frequency change simultaneously, so that there is no change in the velocity, or do they ...
- 952
1
vote
1
answer
334
views
Diffraction limit of light
What is the diffraction limit of light? I see the following explanation in many papers on plasmonics:
Light can be focused to dimensions no smaller than roughly half the wavelength
What is the ...
CommunityBot
- 1
2
votes
0
answers
30
views
Why does oxygen green (S1) emission in aurorae only occur at lower altitudes? [duplicate]
Aurorae have a red color at high altitudes caused by the excitation of atomic oxygen and the subsequent emission at about $630 \,\text{nm}$. This happens at high altitudes because at that height there ...
- 12.1k