Multiple choice

Neutron (n) discovered by

  1. J.J. Thompson by

  2. Chadwick

  3. Goldstein

  4. Yukawa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

James Chadwick discovered the neutron in 1932 through experiments involving alpha particle bombardment of beryllium. J.J. Thompson discovered the electron, Goldstein discovered the proton (canal rays), and Yukawa proposed the meson theory. Chadwick's discovery completed the picture of the three main subatomic particles.

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