(B) Cathode rays are streams of negatively charged particles known as $electrons$. These rays are produced when a high voltage is applied across a dis

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Streams of negatively charged particles (electrons) emitted from the cathode in a discharge tube.

(B) Cathode rays are streams of negatively charged particles known as $electrons$. These rays are produced when a high voltage is applied across a discharge tube containing gas at a very low pressure. The rays originate from the $cathode$ (negative electrode) and travel towards the $anode$ (positive electrode).

Class 11 Chemistry Structure of Atom Discovery and Properties of anode, cathode rays neutron and Nuclear structure

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What are cathode rays?

A
Streams of positively charged particles.
B
Streams of negatively charged particles (electrons) emitted from the cathode in a discharge tube.
C
Electromagnetic radiation emitted by the anode.
D
Neutral particles moving at high speed.