25. IE •• Carbon-14 dating is used to determine the age of some unearthed bones.

(a) If the activity (in decays/min per gram of carbon) of bone A is higher than that of B, then A is (1) older than, (2) younger than, (3) the same age as B. Explain your reasoning.

(b) A sample of A is found to have 4.0 beta decays/(min⋅g) of carbon, while B’s activity is only 1.0 beta decay/(min⋅g) of carbon.

What is the age difference between the bones?