Class 12 Physics Modern Physics Nuclei



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)
(a)
1672 years
(b)
2391 years
(c)
3291 years
(d)
4453 years
Correct answer: (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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solid and semiconductor devices
nuclear physics
electrons and photons
atomic physics
dual nature of radiation and matter


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