Question

6. The half life for uranium-235 is 7.0x108 years.
a. How many half-lives did the sample go through at the end of 2.8x10 years​

Answer 1

Answer:

$\large \boxed{4.0}$

Explanation:

$\text{No. of half-lives} = 2.8  \times 10^{9 } \text{ yr} \times \dfrac{\text{1 half-life}}{7.0 \times 10^{8} \text{ yr}} = \textbf{4.0 half-lives}\\\\\text{The sample went through \large \boxed{\textbf{4.0 half-lives}} }$