Question

calcium-45 has a half-life of 162.7 days. if four half-lives have elapsed, how much time has passed?

Answer 1

Half-life is the time required for a quantity to reduce to half its initial value. If four half-lives have elapsed for calcium-45, then it would be 4x162.7 = 650.8 days have passed. Hope this answers the question. Have a nice day. Feel free to ask more questions.

Answer 2

Answer:

650.8 days

Explanation:

if the half-life is 162.7 days and the number of half-life days has elapsed 4 times.

To know the number of days that have passed we must multiply the half-life by 4

$4(162.6)= 650.8 days$