MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
Which scientist announced the existence of antimatter?
Think it through first, then pick an option.
- a Hubble
- b Otto Hahn
- c Dirac
- d Roentgen
Answer and explanation
Correct answer: c Dirac
Dirac announced the anti-particle in 1931, and it was discovered the very next year.
Why the other options are wrong
- a Hubble: Hubble showed in 1924 that the universe is expanding; the anti-particle was announced by Dirac.
- b Otto Hahn: Not Otto Hahn; joining the quantum theory with relativity, Dirac announced the anti-particle.
- d Roentgen: Roentgen discovered X-rays in 1895; the anti-particle was announced by Dirac.
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