Difference between revisions of "Radioactivity"
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: The '''radioactivity''' of a [[sample]] depends upon the amount of [[Unstable Isotope|unstable isotopes]] in the [[sample]] and the [[Half Life|half life]] of the [[isotope]]. | : The '''radioactivity''' of a [[sample]] depends upon the amount of [[Unstable Isotope|unstable isotopes]] in the [[sample]] and the [[Half Life|half life]] of the [[isotope]]. | ||
: '''Radioactivity''' is a [[scalar]] quantity as it has [[magnitude]] but does not have a direction. | : '''Radioactivity''' is a [[scalar]] quantity as it has [[magnitude]] but does not have a direction. | ||
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Revision as of 20:38, 20 April 2019
Key Stage 4
Meaning
Radioactivity is the emission of ionising radiation from a sample of unstable isotopes.
About Radioactivity
- The term radioactivity was first coined by Marie Curie who also discovered the elements Polonium and Radium which were radioactive.
- The radioactivity of a sample is measured in Becquerels (Bq) which is the number of radioactive decays in a sample per second.
- The radioactivity of a sample depends upon the amount of unstable isotopes in the sample and the half life of the isotope.
- Radioactivity is a scalar quantity as it has magnitude but does not have a direction.