A Certain Radioactive Substance Is Decaying at a Rate Proportional

question 35

Multiple Choice

A certain radioactive substance is decaying at a rate proportional to the amount present. If 100 grams decays to 13.5 grams in 4 years, how long will it take for 90 grams to decay to 30 grams?

• A) 2.405 yr
• B) 2.195 yr
• C) 0.501 yr
• D) Problem cannot be solved as stated.

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