If we start with 1.000 g of strontium-90, 0.908 g will remain after 4.00 yr. This means that the half-life of strontium-90 is __________ yr.

Question

Quizplus · Accepted Answer

The half-life of a radioactive substance is the time it takes for half of the original amount to decay. Using the given information, we can set up the following equation:
0.5(1000 g) = 908 g
(1/2)^n = 0.908/1000
n = (log 0.908 - log 1000) / log 1/2
n = 28.8 years
Therefore, the half-life of strontium-90 is 28.8 years.

If We Start with 1