What is the `alpha` - activity in disintigration per minute 1 gm sample of `""^(226)Ra. (t_(1//2) = 1620 " year" )`

Fill in the blanks with appropriate items : The alpha -activity of 1 gm .^(226) Ra. (t_(1//2)=1620 year) is _______ dpm.

A wooden box excavated from Indus valley had an activity of 9.3 disintegration per minute per gm of carbon. What is the approximate age of this civilization?

What is carbon dating ? Explain. In a sample of wood C-14 activity is 10% of the activity found in fresh wood. Calculate the age of wood sample. (t_1/2 for C-14 is 5760 years )

A radioactive sample had an initial activity of 28 disintegrations per minute. 30 minutes later, its activity became 14 disintegrations per minute. How many atoms of the radioactive nuclide were present intially ?

Half life of ""^(226)Ra is 1600 years. How many distintegrations per second occur in 1 gram of ""^(226)Ra ?