question_answer

A piece of bone of an animal from a ruin is found to have  activity of 12 disintegrations per minute per gm of its carbon content. The 14C activity of a living animal is 16 disintegrations per minute per gm. How long ago nearly did the animal die? (Given half-life of 14C is t1/2 = 5760 years) [JEE ONLINE 12-04-2014]

A) 1672 years

B) 2391 years

C) 3291 years

D) 4453 years

Correct Answer: B

Solution :

[b] Given, for

dis

A = 12 dis

years

Now,

per year

Then, from,

years.