discharge tube for discovery cathodes rays
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Cathode rays (also called an electron beam or e-beam) are streams of electrons observed in vacuum tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, glass behind the positive electrode is observed to glow, due to electrons emitted from and traveling away from the cathode (the electrode connected to the negative terminal of the voltage supply). They were first observed in 1869 by German physicist Johann Wilhelm Hittorf, and were named in 1876 by Eugen Goldstein Kathodenstrahlen, or cathode rays.[1][2] In 1897, British physicist J. J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the electron. Cathode ray tubes (CRTs) use a focused beam of electrons deflected by electric or magnetic fields to create the image on a television screen.
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Discharge tube is also called "CROOCK TUBE". It is made of a glass tube which consists of two metallic plates. One plate is connected to positive terminal of high voltage power supply and the other to negative terminal. The plate connected to the positive terminal is called "ANODE" the other connected to negative terminal is called "CATHODE". The tube is filled with any gas.
EXPERIMENT
In discharge tube experiment, at low pressure and at very high voltage, an electric current is passed. Due to passage of electric current, a stream of rays is passed in the tube originating from cathode. These rays are called "CATHODE RAYS".For latest information , free computer courses and high impact notes visit :www.citycollegiate.com
PROPERTIES OF CATHODE RAYS
These rays originate from cathode.
Cathode rays travel in straight line.
Cathode rays carry negative charge.
Cathode rays are deflected by electric field.
Cathode rays are deflected by magnetic field.
These rays consist of material particles.
The ratio e / m of these particles was 1.76 x 108 col / gm.
Cathode rays consist of "electron".
The rays, upon striking glass or certain other materials, cause them to glow.
EXPERIMENT
In discharge tube experiment, at low pressure and at very high voltage, an electric current is passed. Due to passage of electric current, a stream of rays is passed in the tube originating from cathode. These rays are called "CATHODE RAYS".For latest information , free computer courses and high impact notes visit :www.citycollegiate.com
PROPERTIES OF CATHODE RAYS
These rays originate from cathode.
Cathode rays travel in straight line.
Cathode rays carry negative charge.
Cathode rays are deflected by electric field.
Cathode rays are deflected by magnetic field.
These rays consist of material particles.
The ratio e / m of these particles was 1.76 x 108 col / gm.
Cathode rays consist of "electron".
The rays, upon striking glass or certain other materials, cause them to glow.
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