Listen to the full series on BBC Sounds. Hans Geiger and Ernest Marsden tested the plum pudding model. They aimed beams of positively-charged particles at very thin gold foil. These particles ...

Listen to the full series on BBC Sounds. Hans Geiger and Ernest Marsden tested the plum pudding model. They aimed beams of positively-charged particles at very thin gold foil. These particles ...

As part of an experiment with x-rays ... the particles went right through the foil, which would be expected if the atoms in the gold were like a plum pudding. But every now and then, a particle ...