An Initial Amount of 300 G of the Radioactive Isotope

question 13

Multiple Choice

An initial amount of 300 g of the radioactive isotope thorium-234 decays according to , where t is in years. How long does it take for half of the initial amount to disintegrate? This time is called the half-life of this isotope. Round your answer to one decimal place. ​

• A) 240.5 years
• B) 170.7 years
• C) 24.5 years
• D) 27.5 years
• E) 245.1 years

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