The half - life for radioactive decay ...

The half - life for radioactive decay of `""^(14)C` is 5730 years . An archaeological artifact containing wood had only 80% of the `""^(14)C` found in a living tree. Estimate the age of the sample .

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1845 y

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Half - life period of ""^(14)C is 5770 years . If and old wooden toy has 0.25% of activity of ""^(14)C Calculate the age of toy. Fresh wood has 2% activity of ""^(14)C .

The normal activity of living carbon - containing matter is found to be about 15 decays per minute for every gram of carbon. This activity arises from the small proportion of radioactive ._(6)^(14)C present with the stable carbon isotope ._(6)^(12)C . When the organism is dead, its interaction with the atmosphere (which maintains the above equilibrium activity. ceases and its activity begins to drop. From the know half-life (5730 years.) of ._(6)^(14)C , and the measured activity, the age of the specimen can be approximately estimated. This is the principle of ._(6)^(14)C dating used in archaeology. Suppose a specimen from Mohenjodaro gives an activity of 9 decays per minute per gram of carbon. Estimate the approximate age of the Indus-Valley civilisation.

The half life of a stream of radioactive particles moving along as straight path with a constant kinetic energy of 4 eV is 1 minute. The percentage of particles which decay before travelling a distance of 3.6 km is (Mass of the radioactive particles = 3 . 2 xx 10 ^(-21) kg and charge of the electron = 1.6 xx 10 ^(-19) C ).

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