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Ficheru:Crookes tube two views.jpg

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Descripción
English: Two photos of a Crookes tube; one by ordinary light and one showing it in operation lit by its own fluorescence. In operation several thousand volts of DC electricity is applied between the two electrodes in the tube. The electrode to the left is the cathode or negative electrode, the electrode in the L-shaped tube at bottom is the anode or positive electrode. Electrons released by the cathode are attracted toward the positive space charge in center of the tube, created by the positive anode at bottom, and they accelerate down the tube to the right. Because of inertia, many electrons speed past the anode rather than actually hitting it. They hit the glass wall of the tube, making the glass fluoresce green; after that, they eventually travel to the anode and leave the tube, passing through the wires and the power supply and back to the cathode. The cross-shaped metal plate blocks the electrons, casting a cross-shaped shadow on the glowing wall, demonstrating that the electrons travel in straight lines. The cross can be folded down against the floor of the tube, showing it is the cause of the shadow. The shadow can be moved and distorted by holding a permanent magnet to the side of the tube, demonstrating the bending effect that magnetic fields exert on electron rays. This 'Maltese cross' demonstration form of Crookes tube was first made by Juliusz Plucker in 1869, and was very popular in classrooms around the turn of the century. Alterations to image: Cropped component images and combined into one image.
Data Tomada el 29 de marzu de 2007
Fonte File:Crookes tube-not in use-lateral view-standing cross prPNr°07.jpg and File:Crookes tube-in use-lateral view-standing cross prPNr°11.jpg
Autor D-Kuru
Permisu
(Cómo reutilizar esti ficheru)
I, D-Kuru the author of this image, release it under the following licences:
w:es:Creative Commons
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Este archivo se encuentra bajo la licencia Creative Commons Attribution-Share Alike 2.0 Austria license.
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w:es:Creative Commons
reconocimientu compartir igual
Este archivo se encuentra bajo la licencia Creative Commons Attribution-Share Alike 3.0 Austria.
Ye llibre:
  • pa compartir – pa copiar, distribuir y comunicar públicamente la obra
  • pa remezclar – p'adautar la obra
Baxo les condiciones siguientes:
  • reconocimientu – Tienes de dar el créitu apropiáu, apurrir un enllaz a la llicencia ya indicar si realizasti dalgún cambéu. Puedes faelo de cualquier mou razonable ,pero non de manera que suxera l'encontu del autor pa ti o pal usu que faigas.
  • compartir igual – Si entemeces, tresformes o te bases nesti material, tienes de distribuir les tos contribuciones baxo la mesma llicencia o una compatible cola orixinal.

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Attribute me as "D-Kuru from Wikimedia Commons" or "D-Kuru/Wikimedia Commons". Second suggestion is preferred. You can find an example of how the image could be used in the „Disclaimer“ section. You can also visit the help page Commons:Reusing content outside Wikimedia for further information.

Used camera:
This image was taken using a Canon Digital IXUS 850 IS.
Author: D-Kuru/Wikimedia Commons
Licence: CC-BY-SA-3.0-AT


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Otres versiones Component images: File:Crookes tube-not in use-lateral view-standing cross prPNr°07.jpg, File:Crookes tube-in use-lateral view-standing cross prPNr°11.jpg

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Data/HoraMiniaturaDimensionesUsuariuComentariu
actual15:58 7 may 2008Miniatura de la versión a fecha de 15:58 7 may 20082022 × 2115 (512 kB)Chetvorno{{Information |Description=Two photos of a Crookes tube; one by ordinary light and one showing it in operation lit by it's own fluorescence. Alterations to image: Cropped component images and combined into one image. |Source=[[:Image:Schattenkreuzröhr

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