[صـ السمو ـاحب]

لو سمحتو اذا احد يقدر يحل هذي المسئله ضروري واكون شاكرا لهو
ارجو المساعده اذا سمحتم :

As ample of material contain : 20 micro yrams of californium 252 Cali fermium _ 252has a half Life of 2,638 years .
Calculate :
a) The number of Cali fermium 252 atoms in itially present .
b) The activity of the californium 252 in curies .
c) The number of Cali fermium 252 atoms that will remain in 12 years .
d) The time it will taue fo the activity to reach 0,001 curies .