Cathode rays consist of _____.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Electrons
Cathode rays are the rays that stream from the cathode (negative electrode) of a discharge tube when a high voltage is applied across a gas at very low pressure. J.J. Thomson showed in 1897 that they bend towards the positive plate in an electric field, so they are made of tiny negatively charged particles, the electrons. The rays are the same whatever the gas or the metal of the cathode, which showed that electrons are present in all atoms.