A Radioactive Substance Is Observed to Disintegrate at a Rate $\frac { 9 } { 10 }$

question 55

Multiple Choice

A radioactive substance is observed to disintegrate at a rate such that $\frac { 9 } { 10 }$ of the original amount remains after one year. What is the half-life of the substance?

• A) 0.301 yr
• B) 0.588 yr
• C) 0.556 yr
• D) 6.579 yr

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