Provide an appropriate response.
-Suppose a radioactive substance has a half-life of 2000 years. What fraction will be left after 8000 years?
A) $\frac { 1 } { 8 }$
B) 16
C) 8
D) $\frac { 1 } { 16 }$

Question

Provide an appropriate response.
-Suppose a radioactive substance has a half-life of 2000 years. What fraction will be left after 8000 years? 
A) $\frac { 1 } { 8 }$
B) 16
C) 8
D) $\frac { 1 } { 16 }$

Quizplus · Accepted Answer

The half-life of a substance is the time it takes for half of it to decay. After 8000 years, which is four half-lives (8000/2000), the fraction remaining is $(\frac{1}{2})^4 = \frac{1}{16}$.

Provide an Appropriate Response 18\frac { 1 } { 8 }81​

Provide an Appropriate Response $\frac { 1 } { 8 }$