talithataylor talithataylor

03-05-2018
Physics

contestada

A 500g sample of Potassium-40 is left to decay radioactively. After 3.9 x 109 years, about how many grams of Potassium-40 are expected to remain? [The half-life of Potassium-40 is 1.3 x 109 years.]

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madolynb madolynb

07-05-2018

The answer is 62.5 grams

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cendariuswalker cendariuswalker

09-05-2018

it is 62.5g i know for a fact i major and a teacher i'm science and math

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