<P> 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 . 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 . </P>
<P> 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 . 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 . </P>
who discovered the electron using a cathod ray
who discovered the electron using a cathod ray
J.J. Thomson
J.J. Thomson