MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
Who announced the existence of antimatter using the quantum theory together with the theory of relativity?
Think it through first, then pick an option.
- a Dirac
- b Roentgen
- c Becquerel
- d Marie Curie
Answer and explanation
Correct answer: a Dirac
Using the quantum theory together with the theory of relativity, Dirac announced the existence of the anti-particle in 1931.
Why the other options are wrong
- b Roentgen: Roentgen discovered X-rays in 1895; the anti-particle was announced by Dirac.
- c Becquerel: Becquerel showed in 1896 that radiation comes from the centre of the atom; the anti-particle was announced by Dirac.
- d Marie Curie: Pierre and Marie Curie discovered radium in 1899; the anti-particle was announced by Dirac.
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