Question

The half-life of a certain element is 100 days. How many half-lives will it be before only one-fourth of this element remains? 4

50
25
2

Answer 1

the answer is 2 half lives, i checked

Answer 2

Answer;

2 half lives

Step-by-step explanation;

-Half life is the time taken by a radioactive isotope to decay to half of the original amount.

-For example; if the original mass is 100% the time it takes to decay to 50% is the half life.

-Therefore, in our case; for the element to decay from 1 whole to a half of the element, is one half life, then decaying from a half to one-fourth of the element will be another half life, which means there are two half lives for an element to decay to one-fourth of the element.