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They travel at high speed when voltage is applied to the electrodes. Electrons are attracted to the anode and travel in straight lines across the space between the two electrodes.Ĭathode rays are invisible, but their effect is to excite atoms in the glass opposite of the Cathode by the anode. Since the negative charge repels electrons, the Cathode is seen as the source of the cathode ray in the vacuum chamber. The electrode at the positive end is called an anode. The electrode at the negative end is called a cathode. Thomson was awarded the Nobel Prize in Physics for this work. He found that the mass of the particles on the cathode ray is 1800 times lighter than hydrogen, the lightest element J.J. This subatomic particle was later named electrons. Thomson discovered a new subatomic constituent of cathode rays in the year 1897. He used Crookes tunes and observed shadows and observed shadows cast on the glowing wall opposite the negative electrode in the tube. Johann Hittrof discovered cathode rays in the year 1869. Below a certain pressure, the glow assumed a stratified pattern of bright and dark bands. The latter phenomenon had been studied since the early eighteenth century.īy the middle of the nineteenth century, it was known that the passage of electricity through a partly evacuated tube produced a glow in the gas, whose color depended on its chemical composition and its pressure. The detection of cathode ray was a by-product of investigating the discharge of electricity through rarefied gases. These Cathodes travel in a straight-line path at high speed when a voltage difference is applied to the electrodes. Cathode rays are the beam of electrons traveling from the negatively charged Cathode to the positively charged anode at the other end of the vacuum tube.