A piece of wood from an archaeological source has a `"^14C` activity which ls 60% of the activity found in fresh wood today. Calculate the age of the archaeological sample (the half life period of C-14 is 5770 years).

A piece of wood from the ruins of an ancient building was found to have a "^14C activity of 12 disintegrations per minute per gram of its carbon content. The "^14C activity of the living wood is 16 distintegrations per minute per gram. How long ago did the tree, from which the wooden sample came, die? Given half-life of "^14C is 5760 years.

The amount of ._(6)^(14)C isotope in a piece of wood is found to one fourth (1/4) of that present in a fresh piece of wood. Calculate the age of the piece of wood (t_(12) "of "_(6)^(14)C=5770 "years") a) 7999 year b) 11543 year c) 16320 year d) 23080 year

The half-life for radioactive decay of .^14C is 5730 years. An archaeological artifact contented wood that has only 80% of the .^14C found in living tree. Estimate the age of the sample.

In a sample of wood, the reading of a counter is 32 dpm and in a fresh sample of tree it is 122dpm . Due to error counter gives the reading 2 dpm in absence of .^(14)C . Half life of .^(14)C is 5770 years . The approximate age (in years) of wood sample is :

Uranium - 234 is radioactive and emits alpha -particles at what appears to be a constant rate.A sample of uranium - 234 of mass 2.64 mu G is found to hae an activity of 604 Bq. Calculate for the sample of Uranium -234 the half-life in years.

The half life period for radioactive decay of ""^(14)C is 5670 years. An archaeological artifact contained wood had only 80 % the ""^(14)C found in a living tree. Estimate the age of the sample.

A cobalt-60 source having a half-life of 5.27 years is calibrated and found to have an activity of 3.50 xx 10^5 Bq.The uncertainty in the calibration is +- 2% .Calculate the length of time.in days, after the calibration has been made, for the stated activity of 3.50 xx 10^5 Bq to have a maximum possible error of 10%.

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 "_6^14C present with the stable carbon isotope "_6^12C . 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 known half-life (5730 years) of "_6^14C , and the measured activity, the age of the specimen can be approximately estimated. This is the principle of "_6^14C 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.