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The radioactivity due to C14 isotope of ...

The radioactivity due to `C_14` isotope of same of wood from an ancient tomb was found to be nearly halkf of fresh wood the tomb is therefore about (half life =6000 years)

A

3000 years old

B

9000 years old

C

6000 years old

D

12000 years old

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Before the year 1900 the activity per unit mass of atmospheric carbon due to the presence pf 14^C averaged about 0.2555 bqper gram of carbon: An archaelogical speciman ,assuming that ts activity per unit mass of carbon when the speciman died was equal to the average value of the air ?Half -life 14^c is 5730 years?

Before the year 1900 the activity per unit mass of atmospheric carbon due to the presence of 14 C averaged about 0.255Bq per gram of carbon. An archaeological specimen containing 500 mg of carbon, shows 174 decays in one hour. What is the age of the specimen, assuming that its activity per unit mass of carbon when the specimen died was equal to the average value of the air?Half life of ^ 14 C is 5730years?