# Question

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

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

(b) A sample of bone A is found to have 4.0 beta per gram of carbon, while bone B’s activity is only 1.0 beta for each gram of carbon. What is the age difference between the two bones?

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

(b) A sample of bone A is found to have 4.0 beta per gram of carbon, while bone B’s activity is only 1.0 beta for each gram of carbon. What is the age difference between the two bones?

## Answer to relevant Questions

Prove that the number N of radioactive nuclei remaining in a sample after an integer number (n) of half-lives has elapsed is N –No/2n = (1/2)n No. Here No stands for the initial number of nuclei. A basement room containing radon gas (t1/2 = 3.82days) is sealed to be airtight. (a) If 7.50 x 1010 radon atoms are trapped in the room, estimate how many radon atoms remain in the room after one week. (b) Radon undergoes ...Use Avogadro’s number (Section 10.3) to show that 1u = 1.66 x 10-27kg. Suppose an alpha particle could be removed intact from an aluminum-27 nucleus (m = 26.981 541 u). (a) Write the equation that represents this process and determine the daughter nuclide. (b) If the daughter nuclide has mass ...A cancer treatment called the gamma knife (see Insight 29.1, Biological and Medical Application of Radiation) uses focused 60Co sources to treat tumors. Each 60Co nucleus emits two gamma rays, of energy 1.33 MeV and 1.17 ...Post your question

0