Question 7:
Cathode rays are a beam of:
[SSC CPO 25-11-2020 (Morning)]
A. positrons
B. neutrons
C. protons
D. electrons
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Answer:
Answer: D. electrons
Detailed Solution:
- Cathode rays are beams of electrons, which are tiny, negatively charged particles.
- These rays are produced inside a cathode ray tube when electricity is passed through a vacuum.
- The name “cathode rays” comes from the fact that they are emitted from the cathode (negative electrode) in the tube.
- J.J. Thomson discovered that cathode rays are actually made of electrons during his experiments in 1897.
- Cathode rays are important because they helped scientists understand the existence of electrons and the structure of the atom.
Why the other options are incorrect:
- Positrons (A) are positively charged particles but are not involved in cathode rays.
- Neutrons (B) are neutral (no charge) and are found in the nucleus of atoms, not in cathode rays.
- Protons (C) are positively charged particles found in the nucleus, but cathode rays are made of electrons, not protons.
Thus, the correct answer is D. electrons.
