Question

The half life of $C^{14}$ is $5730$ years. What fraction of $C^{14}$ will remain unchanged after $5$ half lives?

• A. $\frac{1}{16}$
• B. $\frac{1}{8}$
• C. $\frac{1}{64}$
• D. $\frac{1}{32}$

Answer 1

Answer: (D)

$\frac{1}{32}$

Fraction undecayed after $5$ half lives is $1/2^5=1/32$