- Created by: Rianne B
- Created on: 23-04-13 21:21
A diagram to show the scattering of alpha particles
Geiger and Marsden were scientists who carried out an experiment to find out more about atoms. They fired alpha particles from a radioactive source at a very thin piece of gold foil which was only one atom thick. They used a detector to find out where the alpha particles went after travelling through the foil. The experiment was carried out in a vacuum because air particles stop alpha particles travelling very far.
Observation ---------------> Conclusion
- Most alpha particles went straight through -------> Most of an atom is empty.
- A few alpha particles are deflected by a small angle ----> The nucleus must be positive because it repels the alpha particles.
- Occasionally an alpha particle is deflected through an angle greater thna 90. ----> The nucleus is veyr small indeed as very few alpha particles get close to the nucleus.
Factors affecting the deflection of alpha particles
1) charge on the nucleus - the greater the charge on the nucleus the…