No higher resolution available.
Quasimomentum.gif (360 × 223 pixels, file size: 1.81 MB, MIME type: image/gif, looped, 251 frames)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
| Description |
English: Since you can draw an infinite different sinusoidals through the same set of periodically spaced oscillators, you can not unequivocally define a k-vector, and thus a momentum.
A didactic animation. |
| Date | |
| Source | https://twitter.com/j_bertolotti/status/1060532687436431362 |
| Author | Jacopo Bertolotti |
| Permission (Reusing this file) |
https://twitter.com/j_bertolotti/status/1030470604418428929 |
Mathematica 11.0 code
p1 = Table[
Show[
Plot[Cos[x] Sin[t], {x, 0, 9},
PlotStyle -> {Gray, Thick, Opacity[(Erf[t - 6.5] + 1)/2]},
PlotRange -> {-1.1, 1.1}, Axes -> False]
,
Plot[Cos[(1 + (2 \[Pi])/a) (x)] Sin[t], {x, 0, 9},
PlotStyle -> {Purple, Thick, Opacity[(Erf[t - 13] + 1)/2]}]
,
Plot[Cos[(1 + 2 (2 \[Pi])/a) (x)] Sin[t], {x, 0, 9},
PlotStyle -> {Orange, Thick, Opacity[(Erf[t - 18.5] + 1)/2]}]
,
Graphics[{PointSize[0.03], Point[p[t] ]} ]
, PlotPoints -> 100
]
, {t, 0, 25, 0.1}];
ListAnimate[p1, 10]
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
 
|
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
|
|
This image, originally posted to Flickr, was reviewed on 7 April 2019 by the administrator or reviewer Ronhjones, who confirmed that it was available on Flickr under the stated license on that date. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:38, 8 November 2018 | | 360 × 223 (1.81 MB) | Berto | User created page with UploadWizard |
File usage
The following page uses this file:
Global file usage
The following other wikis use this file:
- Usage on ca.wiki.x.io
