1.

A human body required 0.01M activity of a radioactive substance after 24 hours. Half life of the radioactive substance is 6 hours. The injection of maximum activity of the radioactive substance that can be injected is :

Answer»

0.08
0.04
0.16
0.32

Solution :`t_(1//2)=6` hr
`:.` 24 hr =4 half LIFE periods
ACTIVITY after n-half lives `=([A]_(0))/(2^(n))`
`0.01M=([A]_(0))/(2^(4))`
`:.[A]_(0)=0.01xx16=0.16M`


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