Concept:Cathode rays are streams of negatively charged particles emitted from the cathode in a vacuum discharge tube.
Explanation:Cathode rays are produced when a high voltage is applied between electrodes in a low-pressure gas tube.
They originate from the negative electrode, called the cathode.
These rays travel in straight lines and carry a negative charge.
They are deflected by electric and magnetic fields, which proves they consist of charged particles.
The direction of deflection is towards the positive plate, matching the behaviour of electrons.
Cathode rays also cause fluorescence and ionise gases.
Each particle in a cathode ray is identical to an electron.
Hence, they are not neutrons, protons, or alpha particles.
Answer:A. Stream of electrons