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Study the word list: GCSE Physics: Radioactivity 2

Key words for GCSE Physics

gamma A gamma ray is a high energy electromagnetic wave emitted by the nucleus to get rid of excess energy.
ray A gamma ray is a high energy electromagnetic wave emitted by the nucleus to get rid of excess energy.
penetrate To penetrate something means to go through it.
radioactive Radioactive decay is when a nucleus becomes more stable by emitting energy.
decay Radioactive decay is when a nucleus becomes more stable by emitting energy.
unstable If something is unstable it is more likely to collapse.
ion An ion is formed when an atom or a group of atoms gains or loses and electron.
frequency Frequency refers to how many waves pass a set point per second.
ionising British English spelling If a substance is ionising, it means it causes ionisation.
ionisation British English spelling The formation of ions is called ionisation.
Geiger-Muller A Geiger-Muller tube is used to detect ionising radiation.
tube A Geiger-Muller tube is used to detect ionising radiation.
half-life The time taken for the count-rate to fall to half its original level is called the half-life.
contamination Contamination is when unwanted radioactive atoms are present.

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gamma
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gamma
ray
penetrate
radioactive
decay
unstable
ion
frequency
ionising
ionisation
Geiger-Muller
tube
half-life
contamination

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