1.

After 2 hours , a radioactive substance becomes (1/16)^(th) of original amount . Then the half life (in min) is ..........

Answer»

60 minutes
120 minutes
30 minutes
15 minutes

Solution :`1overset(t_1//2)rarr((1)/(2))overset(t_1//2)rarr((1)/(4))overset(t_1//2)rarr((1)/(8))overset(t_1//2)rarr((1)/(16))`
`:. 4 t^(1//2)=2` hours
`t_(1//2)=30` MIN


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