JACOPIN / SCIENCE PHOTO LIBRARY JACOPIN / SCIENCE PHOTO LIBRARY
NUCLEAR PHYSICS, DRAWING Rutherford's particle-scattering device. Rutherford's experiment made it possible to ascertain the existence of a dense nucleus in the atom. Radium emits alpha particles which can pierce a very thin sheet of gold foil. Some particles pass through the sheet without being deflected, others are deflected at a tiny angle, and just a few are reflected at a very large angle. Conclusion, they must meet up with something which makes them deflect - a concentrated nucleus.
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