A pieces of bone an animals from a ruin is found to have ^{14}C ac | Filo
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Class 12

Physics

Modern Physics

Nuclei

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A pieces of bone an animals from a ruin is found to have  activity of 12 disintegrations per minute per gm of its carbon content. The activity of of a living animal is 16 disintegration per minute per gm How long ago nearly did the animal die?
(Given half of life is =5760 years)

  1. 1672 years
  2. 2391 years
  3. 3291 years
  4. 4453 years
Correct Answer: Option(b)
Solution:
The initial activity of c -12 is dpm.
after a time of t years, activity reduces to A = 12 dpm.
from Radioactivity Law,
 
where T = Half life
So,
(Ans)
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