Cathode Rays
Category : JEE Main & Advanced
(1) Cathode rays, discovered by Sir William Crooke
(2) They are streams of fast moving electrons.
(3) They can be produced by using a discharge tube containing gas at a low pressure of the order of \[{{10}^{-2}}\,mm\] of Hg.
(4) The cathode rays in the discharge tube are the electrons produced due to ionisation of gas and that emitted by cathode due to collision of positive ions.
(5) Cathode rays travel in straight lines.
(6) Cathode rays are emitted normally from the cathode surface. Their direction is independent of the position of the anode.
(7) Cathode rays exert mechanical force on the objects they strike.
(8) Cathode rays produce heat when they strikes a metal surface.
(9) Cathode rays produce fluorescence.
(10) When cathode rays strike a solid object, specially a metal of high atomic weight and high melting point X-rays are emitted from the objects.
(11) Cathode rays are deflected by an electric field and also by a magnetic field.
(12) Cathode rays ionise the gases through which they are passed.
(13) Cathode rays can penetrate through thin foils of metal.
(14) Cathode rays are found to have velocity ranging \[\frac{1}{30}th\] to \[\frac{1}{10}th\] of velocity of light.
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