Question 5:
J J Thomson received the Nobel Prize in Physics for the discovery of ____?
[SSC-CGL 04/06/19 (Morning)]
A. protons
B. electrons
C. neutrons
D. positrons
Answer:
Answer: B. electrons
Detailed Solution:
J.J. Thomson was a famous physicist from England. In 1897, he made a very important discovery – the electron! An electron is a tiny, negatively charged particle that is found in every atom. Thomson’s discovery changed how scientists understood atoms and matter.
Before this, people thought atoms were indivisible, meaning they couldn’t be split into smaller parts. But Thomson showed that atoms actually have smaller particles inside them. His work helped to develop modern atomic theory.
For his discovery of the electron, J.J. Thomson was awarded the Nobel Prize in Physics in 1906.
Why the other options are incorrect:
- Protons were discovered by Ernest Rutherford in 1917.
- Neutrons were discovered by James Chadwick in 1932.
- Positrons were discovered by Carl D. Anderson in 1932.
So, the correct answer is B. electrons.
