half life of a radioactive substance is 10 days if originally 100mg of the substance was present what will be activity of the substance after 5 days
half life T1/2 = 10days
given time t=5days
N initial =No=0.1g
N final=N=?
N/No= (1/2)^t/T1/2
N=No(1/2)^t/T1/2
=0.1 (1/2)^1/2
=0.1/root2
=0.141g ........
