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Radioactivity
Descrição
A mindmap on the 'Radioactivity' topic for AQA GCSE Physics.
Sem etiquetas
gcse
physics
radioactivity
rutherford scattering experiment
alpha
beta
gamma
science
physics
gcse
Mapa Mental por
Alfonzzzo R
, atualizado more than 1 year ago
Mais
Menos
Criado por
Alfonzzzo R
mais de 9 anos atrás
242
2
0
Resumo de Recurso
Radioactivity
Key Definition
Half-Life
Either:
The time taken for the activity to halve.
The time taken for the number of undecayed nuclei to halve.
Activity
The number of decays per second.
Isotope
An atom of an element with the same number of protons but a different number of neutrons.
Radioisotope
An unstable isotope that will undergo radioactive decay in order to become more stable.
Radioactive Decay
The act of spontaneous and random release of radiation.
Ion
An atom with a charge.
Ionisation
The act of causing an atom to become an ion.
Radiation
Background Radiation
Some materials give off radiation naturally.
For example: Rocks, Air and Space.
There are three types of radiation.
Alpha
Beta
Gamma
They are stopped by different materials.
Radiation Flashcards.
Anexos:
Radioactivity
Atomic Structure
Previously, people believed that the atom looked like a 'plum pudding'.
Rutherford Scattering Experiment
Ernest Rutherford, a British scientist, proved that the atom had a positive nucleus with negative electrons orbiting it.
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.
Anexos de mídia
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