A radioactive sample has initial activity of 28 dpm 30 minutes later its activity 14 dpm . How many atoms of nuclide were present initially?

A radioactive sample has an initial activity of 50 dpm, 20 minute later, the activity is 25 dpm . How many atoms of the radioactivity nuclide were there originally?

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 ?

A radioactive isotope has initial activity of 28 dpm Its activity is reduced to 14 dpm after half an hour. The initial number of nuclide in sample was:

A radioactive sample had an initial activity of 56 dpm . After 69.3 minutes, it was found to have an activity of 28 dpm . Find the number of atoms in a sample having an activity of 100 dpm.

A radioactive sample had an initial activity of 56 dpm . After 69.3 minutes, it was found to have an activity of 28 dpm . Find the number of atoms in a sample having an activity of 100 dpm.

A radioactive sample had an initial activity of 56 dpm . After 69.3 minutes, it was found to have an activity of 28 dpm . Find the number of atoms in a sample having an activity of 100 dpm.

A radioactive sample has an activity of 4 xx 10^7 Ci. Express its activity in .becqueral. and .rutherford..

A radioactive sample had an initial activity of 56 dpm . After 69.3 minutes , it was found to have an activity of 28 dpm , the number of atoms in a sample having an activity of 100 dpm is 10^(x) . The value of x is …….

upon irradiation californium with neutron, a radio chemist discovered a new nuclide having mass number of 250 and a half life of 30 minutes. Three hours after the irradiation, the observed radioactivity due to the nuclide was 10 dis/minute. How many atoms of the nuclide were prepared initially ?