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A certain radioactive isotope has a half-life of 50 years. A scientist determines that there are 200 grams of the radioactive material present today. How Much of the isotope was present 200 years ago?
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A certain radioactive isotope has a half-life of 50 years. A scientist determines that there are 200 grams of the radioactive material present today. How

Much of the isotope was present 200 years ago?

User Michael Merchant
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im guessing 800 50X4 = 200 and 200X4 = 800

i never learned this but i hope its correct.

User JoshuaBox
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