Radioactivity Flashcards
α - alpha
Most ionising, made of 2 protons and 2 neutrons, is stopped by a piece of paper or 5cm of air
β = beta
second most ionising, a fast moving electron, is stopped be a piece of aluminium or 1m of air
γ = gamma
least ionising, an electromagnetic wave
What is the most to least Penetrative Radiation?
Gamma, Beta, Alpha
When does radioactive decay occur?
When a nucleus of a isotope is unstable
What type of radiation can be stopped by 5cm of air?
Alpha radiation
That type of radiation can be stopped by 1m of air?
Beta radiation
What radiation is the most ionising?
Gamma radiation
What is the instrument used to detect radiation?
Geiger counter
What is the most penetrable type of radiation?
Gamma radiation
What type of radiation is the least ionising?
alpha radiation
All atoms consist of mostly empty space? True - False
False
Some alpha particles fired at the gold foil were deflected at angles. This was due to…
Repulsion forces between the positively charged nucleus and the positively charged alpha particles
What did the Plum pudding model suggest about the structure of atoms?
That is was a sphere of positive charge throughout which the electrons were distributed.
Most of the alpha particles went thought the gold foil. The suggested that…
Most of the atom is made up of empty space
