Scattering Experiment


6. The Nucleus

Geiger and Marsden had observed alpha particles bouncing straight back from a sheet of gold foil.

The force that could cause such large deflections had to be large. The positively charged alpha particles were being repelled by a massive positively charged object.

The positive charge in an atom of gold was known, but if this charge were collected on a sphere the size of the atom, the repulsion would be far too weak. To explain the force experienced by the alpha particle the charge would have to be collected in a much smaller sphere.

Next Page