Question : Cathode rays are a beams of:
Option 1: Neutrons
Option 2: Protons
Option 3: Positrons
Option 4: Electrons
Correct Answer: Electrons
Solution : The correct option is Electrons .
Cathode rays are a beam of electrons. They were first observed in the late 19th century in cathode ray tubes, and their discovery played a crucial role in the development of modern physics. The cathode rays are negatively charged particles (electrons) that are emitted from the cathode (negative electrode) in a vacuum tube and travel towards the anode (positive electrode).
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