Q.What are cathode rays ?
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Start your 14-day free trial to unlock the full solution →Cathode rays are beams of electrons produced at the cathode of a discharge tube under high voltage and very low gas pressure.
When a high potential difference (a few kV) is applied across two electrodes sealed in a glass discharge tube containing gas at very low pressure (~0.01 mm Hg), a stream of particles is emitted from the cathode (negative electrode) and travels towards the anode. These particles are called cathode rays.
Properties: they travel in straight lines (cast sharp shadows of objects placed in their path); they are deflected by electric and magnetic fields in a manner showing they carry negative charge; they produce fluorescence on striking a screen (e.g. ZnS); they possess momentum and kinetic energy (can turn a small paddle wheel placed in their path).
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