list five characteristics of cathode rays
Answers
1) They travel in straight line from cathode and cast shadows of metallic objects placed in their path.
2) They cause mechanical motion of small pin-wheel placed in their path. They posses kinetic energy and must be the material particles.
3) They produce fluorescence when they strike the glass wall of the discharge tube.
4) When they strike metal foil, it becomes red and starts glowing.
5) They produce X-rays when they strike a metallic target.
Answer:
cathode rays have the following properties:
•Cathode rays produce mechanical effects. If a small pedal wheel is placed between the electrodes,it rotates. This indicates that the cathode rays consist of material.
•When electric and magnetic fields are applied to the cathode rays in the discharge tube, the rays are deflected thus establishing that they consist of charged particles.
• Cathode rays produce X - rays when they strike against hard metals like tungsten, copper,etc.
• when the cathode rays are allowed to strike a thin metal foil ,it gets heated up. Thus the cathode rays possess heating effect.
• They produce a green glow when strike the glass wall beyond the anode. Light is emitted when they strike the zinc sulphide screen.
• Cathode rays penetrate through thin sheets of aluminium and other metals.
• They affect the photographic plates.
• The ratio of charge to mass i.e., charge / mass is same for all the cathode rays irrespective of the gas used in the tube.