Answers Crowley Original Credit Chemistry B Types of Radioactive Decay — Unit testQuestion 5

5

QuizMultiple Choice

Types of Radioactive Decay — Unit test

Question 5 • Crowley Original Credit Chemistry B

A sample contains 25% parent isotope and 75% daughter isotopes. If the half-life of the parent isotope is 72 years, how old is the sample?

Answer

A

144 years old

B

216 years old

C

288 years old

D

360 years old

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