Alfonzzzo R
Mind Map by , created about 4 years ago

A mindmap on the 'Radioactivity' topic for AQA GCSE Physics.

Alfonzzzo R
Created by Alfonzzzo R about 4 years ago
B2, C2, P2
George Moores
B3, C3, P3
George Moores
Key word flashcards
I M Wilson
Key Biology Definitions/Terms
Discovery - HSC English
P2 Radioactivity and Stars
Physics: section 7 - radioactivity and particles
James Howlett
AQA GCSE Physics Unit 2
Gabi Germain
Physics P3 Fashcards
Holly Bamford
Holly Bamford
1 Key Definition
1.1 Half-Life
1.1.1 Either: The time taken for the activity to halve. The time taken for the number of undecayed nuclei to halve.
1.2 Activity
1.2.1 The number of decays per second.
1.3 Isotope
1.3.1 An atom of an element with the same number of protons but a different number of neutrons.
1.4 Radioisotope
1.4.1 An unstable isotope that will undergo radioactive decay in order to become more stable.
1.5 Radioactive Decay
1.5.1 The act of spontaneous and random release of radiation.
1.6 Ion
1.6.1 An atom with a charge.
1.6.2 Ionisation The act of causing an atom to become an ion.
2 Radiation
2.1 Background Radiation
2.1.1 Some materials give off radiation naturally. For example: Rocks, Air and Space.
2.2 There are three types of radiation.
2.2.1 Alpha
2.2.2 Beta
2.2.3 Gamma They are stopped by different materials.
2.2.4 Radiation Flashcards.


3 Atomic Structure
3.1 Previously, people believed that the atom looked like a 'plum pudding'.
3.2 Rutherford Scattering Experiment
3.2.1 Ernest Rutherford, a British scientist, proved that the atom had a positive nucleus with negative electrons orbiting it.
3.2.2 Alpha particles were fired at thin gold foil. Most particles went through, whilst some were deflected and the rest were reflected. As most past through easily, the atom is mainly empty space. A few were deflected, so... Some were reflected, so... The nucleus is small compared to the rest of the atom, yet it contains most of the mass and of the positive charges.