Question

If $12g$ of sample is taken, then $6g$ of a sample decays in $1hour$. What amount of sample will decay in next hour ?

• A. $6g$
• B. $3g$
• C. $2g$
• D. $1g$

Answer 1

The correct option is B $3g$

Its given that $6g$ decays in $1$ hour, that means half life is $1$ hour. From left $6g$ sample after $1$ hour, half will be decayed in next $1$ hour which is $3g$.

$12g->6gin1hr$
$6g->3gin2hr$