Question

Cathode rays are a beam of:
1. protons
2. positrons
3. electrons
4. neutrons

Answer 1

Correct Answer - Option 3 : electrons

The correct answer is electrons.

• Cathode rays are beams of electrons generated in a vacuum tube.
• The beam of electrons travels from the negatively charged electrode at one end to the positively charged electrode at the other, across a voltage difference between the electrodes.
• The positively charged electrode is known as anode.
• The negatively charged electrode is known as cathode.

• The Vacuum tube is a device consist of electrodes sealed in a glass or metal-ceramic enclosure used in an electronic circuit to control a flow of electrons.
• The Vacuum tube is also known as Electron tube.
• Cathode-ray tubes, Phototubes, Magnetrons, Klystrons, Gyrotrons, and Fluorescent lamps are some examples of Vacuum tube.

Particle	Discovered by	Year	Charge	Mass
Electron	J. J. Thomson	1897	−1.6×10−19	9.1×10-31 Kg
Proton	Eugen Goldstein	1886	+1.6×10−19	1.67×10−27 kg
Neutron	James Chadwick	1932	0	1.67×10−27 kg
Positron	Carl D. Anderson	1932	+1.6×10−19	9.1×10-31 Kg