Question

Cathode rays are group of:

• A. electrons
• B. protons
• C. neutrons
• D. atoms

Hint:

Cathode rays helped in discovery of electron.

Answer 1

The Correct Option is A

Cathode rays are streams of electrons emitted from the negative electrode (cathode) in a vacuum tube. When a high voltage is applied across the electrodes in the vacuum tube, electrons are emitted from the cathode due to thermionic emission and accelerated towards the anode. These electrons travel in straight lines and can be deflected by electric and magnetic fields, confirming their charged particle nature. Cathode rays were fundamental in discovering the electron and understanding its properties.