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Let's focus on radioactive decay to illustrate the concept. Radioactive isotopes are unstable atoms that spontaneously transform into more stable ones by emitting particles or electromagnetic radiation. The half-life of a radioactive isotope is the time it takes for half of a sample of that isotope to decay.
For example, if you start with a certain amount of a radioactive substance, after one half-life, half of that substance will have decayed, and you'll be left with half of the original amount. After two half-lives, only one-fourth of the original substance will remain, and so on.
𓁴𓁿𓂀𓁾𓁵𓁯𓂞𓂤𓂗𓃃𓂾𓂺𓂹
𓃞𓃙𓃖𓃓𓃕𓃓𓃜𓃘𓃙𓃟𓃛𓃞
𓂺𓃂𓂿𓂺𓃃𓃂𓂛𓂏𓅱𓅥𓅩𓅦
𓅹𓅸𓅳𓅩𓅪𓄭𓄫𓄮𓄬𓄗𓄑𓄌𓃦
𓃧𓃨𓃤𓃟𓃓𓃅𓃁𓂽𓃂𓂊𓁾𓂀𓁽
𓁼𓁠𓁛𓁟𓁦𓁜𓁭𓁡𓀔𓀇𓀅𓀋𓀡𓀡𓀕𓀠𓀧𓀨𓀣
𓀷𓀷𓀿𓀿𓁀𓁶𓁰𓁴𓁿𓂀𓁾𓁵𓁯𓂞𓂤𓂗
𓃃𓂾𓂺𓂹𓃞𓃙𓃖𓃓𓃕𓃓𓃜
𓃘𓃙𓃟𓃛𓃞𓂺𓃂𓂿𓂺𓃃𓃂
𓂛𓂏𓅱𓅥𓅩𓅦𓅹𓅸𓅳𓅩𓅪𓄭𓄫𓄮
𓄬𓄗𓄑𓄌𓃦𓃧𓃨𓃤𓃟𓃓𓃅𓃁
𓂽𓃂𓂊𓁾𓂀𓁽𓁼𓁠𓁛𓁟𓁦𓁜𓁭𓁡𓀔𓀇𓀅
𓀋𓀡𓀡𓀕𓀠𓀧𓀨𓀣𓀷𓀷𓀿𓀿𓁀𓁶𓁰𓁴𓁿
𓂀𓁾𓁵𓁯𓂞𓂤𓂗𓃃𓂾𓂺𓂹𓃞𓃙
𓃖𓃓𓃕𓃓𓃜𓃘𓃙𓃟𓃛𓃞𓂺𓃂