Write the Word or Phrase That Best Completes Each Statement $55 \%$

question 131

Multiple Choice

Write the word or phrase that best completes each statement or answers the question.
-A certain radioactive isotope has a half-life of approximately 1350 years. How many years to the nearest year would be required for a given amount of this isotope to decay to $55 \%$ of that amount?

• A) \(1109 \mathrm { yr }\)
• B) \(608 \mathrm { yr }\)
• C) \(1164 \mathrm { yr }\)
• D) \(1555 \mathrm { yr }\)

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Definitions:

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