Sate the properties of anode rays?
The streams of positively charged particles are called anode rays or positive rays or canal rays.
In 1886, Goldstein performed a discharge tube experiment, using a perforated cathode. He observed that in addition to cathode rays, a new kind of rays was also found. These rays passed through the hole of the perforated cathode but traveled in a direction opposite to that of cathode rays. These rays were found to consist of positively charged particles and were called anode rays or positive rays or canal rays.
These rays originate as a result of the knockout of the electrons from the gaseous atoms by the bombardment of high-speed electrons of the cathode rays on them. Thus anode rays are not emitted from the anode but are produced in the space between the anode and the cathode.
(i) Anode rays travel in a straight line
(ii) They are made up of material These particles
(iii) These particles are positively charged gaseous ions.
(iv) The magnitude of the positive charge on these particles is found to depend on the nature of the gas taken in the discharge tube. However, the charge on these particles, though positive is found to be an integral multiple of the magnitude of the charge on an electron, i.e. these particles may carry one, two, three, etc. units of positive charge.
(v) The mass of these particles constituting the anode rays also depends on the nature of the gas taken inside the discharge tube. However, its value is nearly found to be equal to the mass of the atom of the gas.