Which subatomic particle was discovered by J.J. Thomson using cathode ray tube experiments, establishing that atoms are divisible?
Answer and explanation
Correct answer: B. Electron
- Step 1: In 1897, J.J. Thomson demonstrated that cathode rays were composed of negatively charged subatomic particles, now known as electrons.
- Step 2: He measured their charge-to-mass ratio (), proving they were universal constituents of all atoms.
Answer
Electron.
Why not the others: 'Proton' was discovered and characterized by Ernest Rutherford; 'Neutron' was discovered by James Chadwick in 1932; 'Alpha particle' is a helium nucleus emitted in radioactive decay.
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