Jee Advanced
Dual Nature Of Radiation
IIT-JEE 2011 Paper 1 Offline
INTEGER+3 / -02011
The activity of a freshly prepared radioactive sample is 1010 disintegrations per second, whose mean life is 109 s. The mass of an atom of this radioisotope is 10\(-\)25 kg. The mass (in mg) of the radioactive sample is _________.