Cathode rays are normally invisible in this Teltron tube demonstration, enough gas has been left in the tube for the gas atoms to luminesce when struck by the fast-moving electrons.Ĭathode rays or electron beam ( e-beam) are streams of electrons observed in discharge tubes. JSTOR ( February 2011) ( Learn how and when to remove this template message)Ī beam of cathode rays in a vacuum tube bent into a circle by a magnetic field generated by a Helmholtz coil.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. Do not proceed to schedule a custom demo unless you have already conferred with the lecture demonstrator about it.This article needs additional citations for verification. The custom demos section of the website is used by UO chemistry instructors to schedule demonstrations that are not listed in the database. The university shall not be liable for any special, direct, indirect, incidental, or consequential damages of any kind whatsoever (including, without limitation, attorney's fees) in any way due to, resulting from, or arising in connection with the use of or inability to use the web site or the content. The university further disclaims all responsibility for any loss, injury, claim, liability, or damage of any kind resulting from, arising out or or any way related to (a) any errors in or omissions from this web site and the content, including but not limited to technical inaccuracies and typographical errors, or (b) your use of this web site and the information contained in this web site.the university shall not be liable for any loss, injury, claim, liability, or damage of any kind resulting from your use of the web site. The university expressly disclaims all warranties, including the warranties of merchantability, fitness for a particular purpose and non-infringement. This web site is provided on an "as is" basis. "Do not do demos unless you are an experienced chemist!" Please read the following disclaimer carefullyīy continuing to view the descriptions of the demonstrations you have agreed to the following disclaimer. Clicker questions assess student understanding of how the cathode ray tubes led to scientists understanding of the properties of electrons. A block Power Point presentation used to facilitate the demonstrations and the class activity is available. The electron beam is deflected by an electric field and a magnetic field. Cathode Ray Tube # 18 - in a darkened room, the electron beam (cathode rays) shows up on a phosphor screen as a bright blue line. However, when cathode rays strike the pinwheel inside the CRT, the pinwheel begins to spin and move. Cathode Ray Tube #16 - light shined on a pinwheel inside a CRT does not cause the pinwheel to move. Cathode Ray Tube #12 provides evidence that cathode rays are not visible to human eyes. Cathode Ray Tube #14 - cathode rays cast a shadow behind a Maltese Cross. A series of cathode ray tubes graphically demonstrate various properties of the electron. The activity sheet has embedded questions designed to promote small group discussions. The diagrams help students understand the significance of each experiment. The activity sheet has diagrams of each of the cathode ray tubes used in the demonstration. A class activity sheet accompanies the cathode ray tube demonstrations and experiments.
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