In 1991, the frozen remains of a Neolithic-age man, nicknamed Otzi, were found in the Italian Alps

Question:

In 1991, the frozen remains of a Neolithic-age man, nicknamed Otzi, were found in the Italian Alps by hikers. The body was well preserved, as were his bow, arrows, knife, axe, other tools, and clothing. The date of his death can be determined using carbon-14 dating.

(a) What is the decay constant for 146C?

(b) How many 146C atoms per gram of 126C are there in a living organism?

(d) For Otzi, the activity per gram of carbon was measured to be 0.121. How long ago did he live?