The half-life of cesium-137 is 30 years.Suppose we have a 170-mg sample.How much of the sample remains after 140 years?

Question

Quizplus · Accepted Answer

The amount remaining after a certain number of years can be calculated using the formula:
Amount remaining = original amount x (1/2)^(time elapsed / half-life)

Substituting the given values, we get:
Amount remaining = 11eaae29_f4ef_7fb5_87fe_6d46e4e7ec99_TB2067_11 x (1/2)^(11eaae29_f4ef_7fb6_87fe_9dfd05acef6e_TB2067_11 / 11eaae29_f4ef_58a3_87fe_573226f6f93d_TB2067_11)
= 11eaae29_f4ef_a6c8_87fe_e7812eadb09d_TB2067_11

Therefore, the answer is B.

The Half-Life of Cesium-137 Is 30 Years