Question

question 1 1 pts the half - life of a radioisotope is 104.3 years. how many half - lives are there in 274.8 years? report only 3 sig - figs.

Explanation:

Step1: Identify formula

Number of half - lives $n=\frac{\text{Total time}}{\text{Half - life time}}$

Step2: Substitute values

$n = \frac{274.8}{104.3}$
$n=2.634707574$

Step3: Round to 3 sig - figs

$n = 2.63$

Answer:

$2.63$