Which of the following elements would be expected to be most ...

[darbym82]

Which of the following elements would be expected to be most stable?
 
  A) Platinum-195
  B) Iron-56
  C) Carbon-12
  D) Bismuth-209
  E) Helium-3

Question 2

The radioactivity due to Carbon-14 measured in a piece of a wooden casket from an ancient burial site was found to produce 20.0 counts per minute from a given sample,
 
  whereas the same amount of carbon from a piece of living wood produced 160. counts per minute. The half-life of Carbon-14, a beta emitter, is 5730. years. Thus we would estimate the age of the artifact to be about
  A) 14,800 years
  B) 20,000 years
  C) 5,700 years
  D) 17,200 years
  E) 11,500 years

[akpaschal]

Answer to Question 1

B

Answer to Question 2

D